Fluker falling to the 2nd would depend on 1) How he does at his Pro Day; 2) How fast the top 3 OTs and top 2 OGs go off the board and 3) how teams project him as a RT vs a G.
I don't see Fluker going ahead of Warmack or Cooper in any event, so at the point those guys are gone, he is effectively the 3rd ranked OG on the board for teams who project him as a G. For those teams, anywhere above the very bottom of the 1st or top of the 2nd is not good value. OTOH if a team sees him as a Day One starter at RT, taking him at 20-25 is completely warranted.
In any event there's no way in h*ll Fluker falls to 50 so if we want him we either have to be willing to make the reach at 20, or via a tradedown that doesn't drop us beyond about 35.
I could even see the Packers taking Fluker with their first round pick since they seem to be struggling for OL talent as well and it appears they will be sticking with Finley at TE (which would take Eifert/Ertz off their board). They actually need interior OL worse than OT but if Fluker falls to their pick the value may be too good for them to resist.