Here are a bunch of not nefarious reasons for Stevens being in the transfer portal:
1. Stevens is simply seeing what's out there, knowing that it is his dream to be drafted into the NFL
2. CJF and TS respectfully disagree on the extent of TS's injury. Team docs are (rationally and objectively) saying to sit out for a lot longer, and TS (rationally and objectively) believes he can play immediately
3. TS wanted to transfer in 2018, and CJF explained (rationally and objectively) that it made better sense to stay, not sit-out a year, and leave after 2018
4. A team with a great offense (combo of players, scheme, national-attention, coaches, etc.) came knocking for TS and TS has the blessings of everybody
Hypothetical in line with DJones piece:
Your son is a 1st or 2nd string on a great (not elite) team (i.e. odds are it will finish in Top 20 but not Top 6).
Your son is eligible to grad-transfer.
Your son has not been the lone starter in his position for one or more years.
Whether your son is drafted or undrafted, signed as a undrafted free agent or not signed, practice squad or no practice squad, invited to the combine or not, largely depends on his performance in 2019.
Your son's goal has always been to attend the combine and be drafted/play in the NFL.
Your son's on-the-field leadership/starting role is not a guarantee if he stays.
If that is the decision matrix, I think most on this board would say that it is, AT THE VERY LEAST more than 51%, the right move to enter the transfer portal and see what is out there.
I hope TS stays. I hope that if TS stays, he stays healthy and starts. If he goes, I hope it is to a school which has games that air in my cable network footprint. Whether he stays or goes, I hope he signs with an NFL team and in 5 years, NFL pundits are saying, "Where the hl did this guy come from?"