Mario super sluggers question?

ok why doesn't bowser jr, hammer bro, and magikoopa have chemistry with dry bones.its just weird. they lots of things in common, for example they all evil, work for bowser, turtles. i don't get it. Daisy has chemistry with birdo, what do they have inc common, NOTHING. Birdo has chemisty with Petey piranha. what do they have in common, nothing. petey piranha and wiggler match with blooper what do have in common nothing. shy guy matches with monty the mole what do they have in common nothing. sheesh man