He has 3 years experience mainly on ST but did start when injuries forced it. You always need CBs an even if most of time they play STs he was a RFA this season an will not be tendered by Browns.
He would be a ok add to roster an earn his spot likely just league minimum
I think he would be a no comp pick up
Thomas will be just 25 next month and has emerged as an every-down special teams player and back-up cornerback who played over 200 snaps on defense in 2020.