I've decided to not make an entire bible as that seemed really gay, so i'll just condense my thoughts.
My entire contention with Aizen's statement isn't with the statement itself, rather people's need to assert this objectively vague statement to only have one valid interpretation, when that, in my opinion, isn't the case.
Aizen saying "though our powers are no longer equal" doesn't inherently assert nor imply that he's referencing his strongest Shinigami form, as in the form which reached the barriers of Shinigami power, that's objectively true given the sentence structure. You can assume such, and use deductive inferences to make a probability claim. Which i'm entirely fine with, but the incessant need to say or act like there's only one valid interpretation is absurd given the statement itself doesn't agree with that interpretation.
Within a vacuum, the claim which asserts Aizen's referencing, say his lieutenant form we see in turn back the pendulum, being equal in strength with Urahara, but after training and reaching his natural max potential he became stronger is equally true to the claim which states he's referencing the version of himself which reached his natural max potential, they're both equally true when examined in a vacuum because the statement is vague in context. It doesn't explain nor imply which version of Aizen is being referenced, it's just a general statement about Urahara being = to Aizen, but after either through training, the hogyoku or both, Aizen became stronger then Urahara, that's it.
That's my gripe with the Aizen statement.