Big mom herself is 8.80M large, with zeus Most like almost 14-15M and still Kaido in hybrid is larger.
I think Hybrid Kaido is around 16m large.
He will have a insane power and speed in sametime, the hype in next chapter going be insane.
Still Oda don´t show BM equal to Hybrid Kaido, so I assume either later when the Navy come or in elbaf.
Also it is rare that the Villian of the arc show first his hybrid before his commanders.
Okay Lucci did it too but I feel here that Kaido have a trumpcard for later.
Im sure he will have a final form, ala awakening(monster point) who make him even stronger.
For next chapter I can see this route:
Kaido stomps the supernova, Luffy transform back to G4 and we get 1on1 with Hybrid Kaido, Luffy get defeated and see that Kaido is still too strong.
Yes Luffy was impressive this chapter, he hitting Kaido over 20-30 Kong guns and it was looking like he really dealt a big damage. But Kaido was still okay and don´t seemed impressive by the attack, neither by Zoro or any other supernova.
It feeling like they could barely damage Kaido, let say of 100% it looking like they barely damaged 2-3% xD
I don´t know how they defeat this monster, but it will be very hard.