Because in each category the character waking up has options that cover fewer and fewer offensive options and/or cost more resources. You can assume that ALL of these reversals have an appropriate punish if they are read and baited.
Meterless DP:
Beats all throws, attacks, and projectiles, for no meter. Clearly the best.
EX “DP”:
Beats all throws, attacks, and projectiles, for 1 bar. Clearly the 2nd best.
…the stuff in the middle is subjective, blah blah blah just ranked things based on the number of options and amount of resources needing to be spent.
EX 3-Frame Armour (2nd worst):
Loses to all true meaty timings, loses to early throws, only beats opponents playing with loose attack or throw timings on wakeup, for 1 bar. Not very good.
Worst (Vega):
Loses to everything. Block, tech, or s.lk if you want to call-out an improperly timed offense.
These aren’t tiers relative to Mika. They’re tiers based on the overall effectiveness of each character’s best options. Top tier reversals beat the most options for the least resources, and the lower down on the list you are you either a) have to spend more resources to access moves with good reversal properties, or b) have reversals that only cover one or two options, but lose to something else.