I have a proposal; why don't we get rid of the low tier for certain characters who have in-verse explaination. For example, the Sentry. Some of his feats can be as low as tier 9 (his humans forms gets complicated to explain sometimes). So, just stick to Varies up to 4-B.
The only reason I see the 6-C rating is because of Blue Marvel scaling, but he can be scales off Ares and Ms Marvel and Hyperion and Namor, who weren't affected heavily by the anti matter like the Sentry was. He is pretty much the only one who scales off him. (King Hyperion scales of Blue Marvel).
So, characters with varied profiles don't really need the 6-C statistics. Because you might want to add a few more statistics then.
And also, the 6-c is wrong cause at his weakest he was busting a moon
This would affect a few people like Mephisto and Galactus. We are only giving them those weak keys because of some scaling. But what we could do is create notes to explain some of the scaling. (Galactus's tiering is a mess right now).
Tho I can see this being rejected immediately because of the Hulk case. Hulk is an interesting case, others are different. But he needs a few more statistics at the very least.