Seriously he is weaker than Edward
Whitebeard have a big weakness his devil fruit destroy his body and even if he want to go berserk he can definitely Defeat the five elder but can his body endures after the fight
Because the whitebeard really need a teleportation fruit cous the crew always in the sea not in one island just like the big mom mirror fruit
The toto land is A group of scattered islands but the mirror fruit mike it Easier
Stussy can have that fruit there should be no drama about her and the world government or cp0 then that would be boring so just gave her the rumble fruit
I think he should go get the thunder fruit first i mean who ginna get lazy knowing that there's the most powerful logia in sky island its a small island he can find it in like a month