Although it says Gear 5th i dont think its luffy's next gear i believe luffy still has a alternate form of Gear 4th Well that for another discussion lets jump into theory
Lets learn a bit about Paramecia types :
Now According to me Awakening can be defined as Max potential of Any Devil fruit ,Now that doesn't mean one changes to logia or something with awakening
for example -Doffy was always able to create strings through his body But with awakening he can change the environment into it strings also
awakening may very from user to user as per as their Devil fruits Like whitebeard was able create earthquakes by sending vibrations into the environment
Luffy's awakening :
Now lets jump by to Luffy like i said
luffy belongs to 1st category of paramecia :who can alter the user's current physical state the greatest feature of Gomo gomu no mi is its elasticity
what is elasticity ?
the ability of an object or material to resume its normal shape after being stretched or compressed, stretchiness.Depending on that luffy will be able to produce elastic wave
What are elastic waves?
elastic wave, motion in a medium in which, when particles are displaced, a force proportional to the displacement acts on the particles to restore them to their original position. If a material has the property of elasticity and the particles in a certain region are set in vibratory motion, an elastic wave will be propagated. For example, a gas is an elastic medium (if it iscompressed and the pressure is then released, it will regain its former volume), and sound is transmitted through a gas as an elastic wave.these elastic waves will enable luffy to produce Shockwaves
Again what are shock waves?
shock wave, strong pressure wave in any elastic medium such as air, water, or a solid substance, produced by supersonic aircraft, explosions, lightning, or other phenomena that create violent changes in pressure. Shock waves dier from soundwaves in that the wave front, in which compression takes place, is a region of sudden and violent change in stress, density, and temperature. Because of this, shock waves propagate in a manner dierent from that of ordinary acoustic waves. In particular, shock waves travel faster than sound, and their speed increases as the amplitude is raised; but the intensity of a shock wave also decreases faster than does that of a sound wave, because some of the energy of the shock wave is expended to heat the medium in which it travels
shock waves are not as uncommon as u may think in One piece
like sengoku used in marineford :
he launched an explosive shock wave with a palm thrust, enough to send a majority of the Blackbeard Pirates flying a fair distance.
this could be foreshadow for luffy using shockwaves to fight blackbeard
same with kuma :
kuma's nikyu nikyu no mi allows him to create shock waves
Now Luffy as fought alot of opponents using shockwaves as their technique
1.Luffy vs satori (one of priests of enel)
2.luffy vs usopp
3. Luffy vs jinbei
as jinbei explains that fishman karate uses elasticity of air and water to create a shockwave
4.Luffy vs don chinjao
chinjao as master of Hasshoken :
fighting style allows the user to control vibrations around their limbs to generate shock waves . This shockwave is powerful enough to destroy a metal shield or defeat a strong man easily. Sai also claimed that these attacks are unblockable and reverberating, causing defenses to shatter
5.Now finally my fav Luffy vs Rob Lucci
In the fight lucci used his fishing move ,The Rokuogan is the secret and ultimate attack of the Rokushiki style. Rob Lucci states that only those who have absolute mastery of the other six skills can have access to this seventh skill.
The user places both his/her fists right in front of the target and launches a devastating shock wave in a forward direction. The burst is a reminiscence to that released by an Impact or Reject Dial, capable of bypassing the defenses of a rubber human such as Monkey D. Luffy, who is immune to blunt strikes under normal circumstances, and causes massive internal injuries
In the Viz Manga, this is called Ultimate Radius: Six King Pistol, while in the FUNimation dub, this technique is called Ultimate Radius: Six King Gun.
maybe foreshadow to luffy's future pistol and Gatling gun techniques as u can see luffy is pretty much weak to shockwave opponents thats why i think he will be using it in is awakening form i believe Rayleigh may have already taught him how to use shock wave by using haki
as he displayed it also
CoA normally used to defend or attack as it acts as a coating but Rayleigh repelled the elephant with some kinda shock
i believe luffy will eventually master all 6 techniques of Rokushiki will lead to him master the 7th technique like Rob lucci which is -Rokuogan
in this form luffy will be able to manipulate any elastic medium such as air, water, or a solid substance,and create strong pressure waves /shock wave
- gear 2-soru
- gear 3-tekkai
- gear 4 -geppo
- shigan similar to haki induces Gatling
- kami-e well he has CoO similar to that
- believe gear 4th alternate version may have Rankyaku
- this completes the 6 forms of Rokushik
- 7th form Rokuogan -shockwave
this form will reduce the haki usage and provide luffy with a long term fighting solution without taking 10 mins breaks like in G4