Oh trust me. Mari would know pretty quickly that Kathryne is blind. She doesn’t respond to visual stimulus, has all her textbooks in braille, and wears her sunglasses at all times.
Kel might be able to win Bacon over but KitKat would probably find him slightly annoying. Charismatic or not, smooth talking and charm doesn’t really work on her. Plus, with Kel being popular, she’d have to be around too many people to hang out with him.