It was explained in the first page a quote from Wake saying that even a giga impact wouldn't harm his sac.
I LOLed. But yes, you are correct.
His personality screams "I'm the incredibly powerful loner" type. If he was a Floatzel, this wouldn't change.
I don't think so really. Treecko was the loner type and it evolved.
I don't think strength determines if a pokemon will evolve or not.
Sure there are pokemon that won many battles in their base stage and never evolved like Pikachu, Piplup, Skitty, Psyduck, Bulbasaur, Squirtle, Corphish, and Cyndaquil.
Bt look at Totodile for example, it was pathetic and it never evolved. It lost most of it's battles without getting a single win, Whitney, Misty, Macey, Duplica, etc.
Chimchar, on the other hand, seemed to be strong enough without evolving just like Bulbasaur and Cyndaquil. It was used in many battles and got a ton of wins. Even so, it evolved.
Isn't that enough to disprove any "patterns"? I think it could go either way at this point. Maybe Buizel will evolve, maybe it won't. With around 30 episode left before the league, I find it odd that they've been evolving Ash's pokemon every 15-20 episodes. In this time they could easily squeeze in two more evolutions.
Buizel could evolve around DP145 and Monferno could evolve at around 160.