Even if a little bit of Gleason pattern 3 was left behind, you don't necessarily have to act on it:
/pcnrv.blogspot.com/2017/11/myth-gleason-6-never-progresses.htmlI changed my mind - I think it's a good idea to have Epstein re-slice the whole mount pathology. It may give you more peace of mind. You might also consider a Decipher test.