The volunds aren't "a weapon" but rather they help their users manifest the tools they desire, i.e. they're a conduit for humans to attain limited divinity.
Lu Bu wanted his halberd because that's all he ever needed to destroy his enemies, Jack wanted those gloves because he's a trickster and...
Alexander can probably control inertia within themselves, as that would allow them to do just about anything they want in terms of motion and physics. Alexander's attacks can accelerate instantly and are not affected by the matter they strike, as any energy is always completely transferred...
Megumi's body and mind have already been irrevocably altered and damaged. The most he can hope for is to reaffirm his desire to live as himself by reclaiming and reforging his own identity.
Chances of his survival are, however, vanishingly slim and he will most likely die with Sukuna by trapping...
Kinugawa isn't dead yet, the explosion will have hurt him - possibly crippled him - but Maria will come finish him off with the cruelty he himself inflicted.
Yusurube probably functions as a beacon for a momo, in the same way that a radar betrays its position with every ping it makes. Even if it's just a moment, if you are smart and quick enough you can use that limited information to triangulate.
Honestly, who could be mad when your fighter still has enough psychotic fighting spirit to raise their sword after being decapitated and scare the shit out of the opponent?
Yes, I said that part of his ribs were shaved off but they otherwise still are in one contiguous piece. The biggest damage would be the serratus anterior muscles which are involved in breathing but I don't think it's going to be fundamentally debilitating. It is a bad flesh wound but not one...
Also, all hail ToGOAT. Sure, homie died, but he died dealing immense psychological damage. Best death in a fight so far bar none (Honda died after the fight was declared over).
Musashi's rib injury was "only" shaved off and not as extreme as some of the others' injuries. I'd wager Yasuke's injury is actually worse as it could significantly interfere with his club and shield fighting style.
Agatha pulling a fast one on everybody by starting the fight with her powers already unleashed. How else is "mystery magic" going to work other than plot twists and intrigue?
Bonnie's theft magic has most likely more requirements than "I steal ur heart lol". Mona Lisa just happened to be too...
Smooth Operators is totally busted. Being able to move anything up to and including the concept of "being cut" is insane. The stand itself might be slow and have near 0 power but JJBA is about using powers smartly and this power is the perfect example of it.