Based on the statement and the demeanor that was described, I think the inference of what he said is that he isn't going to know if he is 100% until he gets into some real action. He said that he "checked all the boxes" so he has passed all the tests, except the final exam which is playing in the finals.
My guess is that he is healed, but possibly not yet fully reconditioned. Healed and back in game shape, the calf and overall, are two different things. There is going to be some level of risk of reinjury. That will be true on Thursday and it will still be true at the start of next season. He is cleared to play. I am sure he wants to play. It would have been nice if his first game back wasn't the first game of the finals, but what can you do.