b. The case of Yan Sen or how meta stuff helps us.
If you agree with the "a" part, then everything is going fine and what I will propose is only a result of a logical conjecture.
Henry is capable to go to any "finite" length in terms of dimensions, that's what we established previously, however, he's unable to catch up to Yan Sen. Why ?
Because Yan Sen is above/beyond the setting.
What would be above a setting that can go to any number of arbitrary dimensions ? Something that is completely out of reach by such a jump. Meaning that, for Yan Sen to be above it, he would need to be infinite in comparison, meaning High 1-B.
Summary : Henry can reach up to any arbitrary number of dimensions depending on his opponent. Yan Sen becomes High 1-B (A possible rating is fine too)