Do you think Jake and Tavros are going to fight Spades Slick, or are they going to gain a (sort of) ally who hates LE and wants to punch his skull face?

Tavros won’t be going with since he’s grounded. As for the Jake/Slick meeting I see two possibilities. Either A) he gains an ally like you suggested or B) Jake mentions his last name is English and Slick tries to beat him up.