Have your thoughts changed on the Reptile-Cage MU? I might be approaching the MU totally wrong but the risk/reward feels like its very much in Cage's favor when he gets in. For example, you (reptile) can dash, beat cage's f3 and take 11%, or he guesses you're dashing and gets approx 20% and you get put back into pressure after being reset with a nutpunch into forceball frame trape, while he builds meter. If I have meter, I can try (as Reptile) to EX dash to beat a JC poke but that can be beaten with a reverse input EX nutpunch after the first hit is blocked and leads back to the whole him building meter, reptile taking chip, and still stuck in his pressure situation. EX armored slide doesn't feel worth the risk, either unfortunately. Using a bar to get out and take 12% when you can just dash and take 11% with the same reward and punishment scenario...seems not worth it. EX slide also is a lot easier to punish; you might get lucky and cage could drop the dash punish (but LBSH, f3 is one the easiest punishes there is for dash)
The other option is you (as reptile) start your pressure when you realize the Cage is waiting for dash, so you can 321 into AH or whatever, but if you're wrong on that guess you lose more than you gain - block damage + meter and little push back vs Cage getting a nutpunch plus all the trimmings that come with it (meter, chip, pressure).
If I were to play a Cage in tournament, I would at this point be using Cyrax, but I like to hear people's thoughts on the MU. Reptile is one of those characters who is good enough that he shouldn't need to have a counter pick option for almost all MU's in my opinion.
If anyone else wants to chime in, feel free.
edit: forgot to add that d3 (his fastest normal at 8 frames) loses to f3 most of the time; not sure if its because f3 low crushes some moves or because retpile's hitbox is raised when he does d3...so poking out of cages pressure with normals is almost completely out of the question in the MU.