Thornton and Scott have been less that expected. They're also not getting many minutes, each averaging less that 20 minutes a game. It takes a while to build Groce's trust and become an important part. Right now, he's going with the guys he trusts and that's why Tribble is playing the point (he's always going to be on the floor whether or not he's the point).
When LCJ left, we lamented our point guard play until X hit his stride. When Big Dog graduated, we lamented the drop off in post play. When McLaughlin left, we missed the great point guard play. When Joe Jakubick left, we missed high scoring guard play. I suspect when Len Paul graduated, we probably missed top notch small forward play. Now we're missing X's play. You always miss the play and contribution of legends.
Scott and Thornton have career three point percentages that are nearly identical to the Zips average this year. I'll be more worried if they haven't settled in by the end middle of February.