Zah Frazier had a very good Combine performance. Always worry with CBs under 190lbs though.
But DARIEN PORTER! Just an absolutely elite combine performance. Gotta re-look at him for sure. I had him like maybe 10th ish in tier below revel, hairston, thomas, morrison, and amos... and with nohl williams, and cobee bryant... but That's certainly worth re-examining. Also Kitan Crawford out of Nevada, who I know like nothing about besides he was at Texas and people actually had speed/burst questions about him... well gotta look into him some more cause his performance was elite too, and his only knock today is his height. But **** at 5'10" 202lbs he ran 4.41, with a 41" vert, a 4.03s shuttle... I guess he's more been at safety, but those are some you wonder if he can be a CB numbers...
You viewing Starks and Barron as more Nickels and/or Safeties? I think both are great players, and I expect both to be 1st rounders. Starks seems like he's going to be another Brian Branch kinda bad combine performer that could fall and end up a steal, and actually has good playing speed. Just a good player.
I like Trey Amos too who you didn't list and he had a solid/good day.
Thomas is hella young- I think one of like 5 youngest in the draft if I'm not mistaken?, which combined with his measurements (height, weight, hand size, arm length/wingspan is good), and I think he's fast too. Though him not doing the drills is a little sus, and the only one he did the broad jump was nothing special.
Zy Alexander had a dog**** day though.