Look, I get that Leo got the thingie because he has the most common sense (a fact that has been shown multiple times throughout the episodes so far), but I think at least a little of it was just him being salty he wasn’t included in Raph’s plan… 

And that’s why I like fighting the old-fashioned way: with impossibly futuristic high-tech weaponry!

Rottmnt Donnie, being the most Donnie Donnie to have ever Donnied