Don't fully agree there. He still can and does compete with the best, he just has badluck. He's just been ko'd to many times in a row to continue. He's lost to top guys that can pop. Taylor was scouted highly before Palvik caught him and was winning the fight. Poor dude.
Taylor has the skills. He just can't take a hit and it has something to do with his brain.
Same with RJJ. The KOs he took by Johnson and Tarver, especially the one where his neck locked up and he was totally out, is a sign of brain damage. IMO RJJ is washed up though, unlike Taylor.