But that wasn´t really a escaping, the BM pirates know that Capone and the alliance was in trouble and couldn´t move anymore, they just need to stay and wait until they come out. Do you forget the second escape plan which totally fail and only get saved by the bomb?
Two whole different situations, why someone as Oven or Big mom would let in the first place let the alliance escape, she has a huge range attack arsenal. It doesn´t matter if fodders stand against her, she will hit many of them with one attack and then?
She was already using his ability death or life and not everyone was immun to that ability. And of course Jinbe don´t let his own crewmates get slaughter by Big mom. He would rather stand against her then just one of his crew member, don´t forget the point, stalling Big mom little more would mean> Strawhats can safety escape not only from her terittory but also in a huge distance.
The problem is, fodders don´t gonna stop Big mom to use her aoe attacks, she don´t get district her either when she could spamm such huge attacks:
Which something like this she could immediately sink a exhausted Germa66 and Sun pirates.
Don´t forget also the fact that the Germa66 and Sun pirates fight four hours, their power wasn´t fresh or at maximum, something as you said wouldn´t be able anymore...
Sanji and co do that while don´t even face a vice admiral on their own or did they battle them off?
Aokiji was sectretly cheering up the Strawhats, of course he don´t do nothing, if he would want to do he would kill them easily off.
She was pissed because of Luffy and Morgan, otherwise she travel back to whole cake island and didn´t care much about them in first place. Do you think a germa and fodder sun pirates can easily escape from a territory when they need 5 hours to go out of totland while Big mom is in back with massiv attacks and without beeing nerfed? They couldn´t even survive in the first escape plan without going down in few seconds/minutes, do you think they can escape while the route take 5 hours to go out of totland?
This panel would mean nothing anymore if everyone could just escape, but this would speak against the previous storywriting of Oda when he need a bomb and a nerf of Big mom to let the alliance escape from Whole cake island.
Also the another point is that Jinbe arrive in Wano after Big mom, even though he should be the first one as fishmen who arrive before Big mom. Why Jinbe need so long time, if we assume your theory he should escape with minor wounds and we speak about a dude who get a magma hole by a Admiral and from exhausted war, yet he was up in few days and could easily move. So the recover point wouldn´t make sense either which could help for the question "why it take a long time for Jinbe to arrive in Wano after Big mom?"...