The most likely thing that is going on here is that he didn't have a concussion last Sunday. Period. Doesn't mean he wasn't injured and doesn't mean that his injury didn't cause him to exhibit concussion-like symptoms, which is why he was put in the protocol (and why he was able to clear that protocol so quickly).

What I am saying is that "IF" he had a concussion, then being far enough along in the concussion protocol to practice on Wednesday, less than 72 hours after the incident on Sunday, and subsequently being recovered enough to fully pass out of the protocol and be cleared to play by Friday, would be an near medical miracle. Doesn't mean it couldn't happen, but it smells funny. It is an outcome that is possible, but not probable. And that raises the specter that someone may be playing fast and loose with things. Not a highly probable outcome, but a possible one.

Here is what CBS Sports reported earlier in the week, and what I believe is the most likely explanation for what we are seeing with Mahomes this week:
https://www.cougarboard.com/board/message.html?id=25455714