Bomu - He owns a cavetube and may stream in the future, I don't know very much about him, though this is what I do know:
1. He's had a lot of times on courses beforehand that were WWtop10 or very close to being so, he had 1:50.4 on TF for a while, if I recall, 2:10.9/2:10.8 on BC glitch that was around for a few months, then improved.
ian - Glitch times shouldn't be doubted due to large improvements, pulling off 2/3 can be considered incredibly lucky and doesn't require good driving to achieve at all.
Fra - Has incredibly fast improvements, and acts like a cheater. Claims many laps that are seemingly incredibly difficult, I don't trust him.
Glaceon - See Cole's post.
Madeno - I don't remember seeing any Japanese accuse him, I trust him.
Shawn - Don't know much about him as a player, he does seem to have come out of nowhere, but it's been shown that some players are simply more talented than others, has no serious claims, slow improvements on a lot of courses as well, I trust him.
Harry (MH guy from Canada) -
https://www.youtube.com/watch?v=wfMyg-qLRck&list=UUTsutSgQZsKXE65i88wQciw he's had regionals since early 2013, he's detached from the community. I don't see a reason to doubt him, he was knocked off and he improved.
Kiryu - If I recall the reason the player "m" had the name "m surpasses TAS" is because he beat Jorge's time, not Kiryu, though I could be wrong.