Are we very much speculating that this is the fault of Tua the quarterback? This is not instead of the Dolphins' offensive line that might not be giving Tua the much required protection that he needs and for their offensive line to give him a few more seconds to throw the ball much more accurately to Tyreek Hill and Jaylen Waddle who are on the top 20 of wide receivers in the NFL? We can agree that Tua is not something similar to Lamar, however, this Dolphin's offensive line can also be blamed for Tua's injury and bad performance.
This is different than what happened with Andrew Luck in which the Colts were completely at fault for letting him become the most punished QB on the entire history of the league during the span of time in which he played, Tua seems to lack the tools to play at the NFL, this is like a heavyweight boxer that has great technique, stamina and punching power but that lacks a solid chin, we know that at some point he is going down since it is impossible to defend yourself from every single incoming punch.
Tua is the same, the hit he took most recently seemed pretty much like any other hit a QB can take, and yet that was enough to cause a concussion, in a way it reminds me of the injury Tony Romo suffered on his shoulder that led to his retirement, since no team wanted to sign him as a normal hit was able to injury him to that extent.