Hard to comment on Fitts or Sandlin since I haven't really followed them. Reports are that Fitts is only a two pitch guy right now and needs great control to work out. Sandlin has really good stuff, but is just far away so we haven't seen him face advanced hitters yet. This year should be a bigger tell for Sandlin.
I think Early has the prototypical starter's build out: frame, left handed, velo, projection, pitch mix. He's ranked fairly low now, but he's someone that could rise in the rankings and become a 4th starter just by being competent at what he does.
Paez and Monegro both need their stuff to pop a little for them to stay in the rotation. Monegro is a little more exciting now, but people are probably sleeping on Paez.
Ian Cundall really likes Hunter Dobbins. He has multiple offspeed pitches. Can pitch deeper into the game than Wikelman at times. 1.10 bb/9 in AA last year.