The portal doesn't discriminate. The only difference may be the winning programs losing 2nd or 3rd string guys vs starters leaving losing programs.
At least Cephas & Mumpfield produced at the FBS level. P5 rejects were P5 for a reason, regardless of their production, whether it be size, speed, athleticism, etc. Lingard's production at Miami FL & Florida was nonexistent, but we saw how much of a stud he was at Akron.
If these FCS/DII players Garner competitive G5/P5 offers in addition to ours, my tune will change, but until then I'm skeptical. Part of the competitive turnaround (despite the record) has been due to replacing entire position groups with P5 transfers.