Beane said on OBL that he and Moore had conversations prior to the draft and decided to "stick a pin in it" until after the draft to garner interest depending on what the Bills did (sign a WR, what round, etc). Since Beane did not have an available WR that he valued where he was drafting, above other players, he waited until round 7. Based on that, the mutual interest was there post draft. That's why Moore was in the building right after the draft.