Thomas is a good value on his current contract. It seems like people are judging him a little quickly as an undersized gunner. Yes, he's a shoot-first PG, but he's a pretty good one.
~25 pts, 6 assists, 4 rebounds, 1.5 steals per 40 on 60% true shooting the last 100 games (and he's averaged over 30 mpg over that period, so it's not a huge extrapolation). Size can be an issue on defense, but he's about average on that end. Take a look at e.g. Harden's numbers his first year in Houston and Thomas gives you about 90% of that offensively (and it's not like Harden plays defense).
All this for about $5M less than Bradley over the next 3 years would make a nice 6th man.