For the R5 draft, it’s really hard for a team trying to compete to get much out of it. Back in the day (as the Cubs did with Rondon), you could grab a live arm and stash them deep in the pen and carry them all season with some fake IL stints. Now the IL stuff is policed much more tightly and with a 13-pitcher limit on the active roster and starters not going as deep, you need every arm in that pen to contribute, so a kid you love who isn’t ready can really hurt the team. The Sox, Marlins and others could certainly grab guys and just let them struggle for a year.
All that said, if you think you have the right guy there, then go for it. At worst you give them back and sometimes, you can work out a trade and then once you do that, you can keep the guy and send him down.