Very doubtful the Bengals ho with anyone other the Burrow, but there is always a slight chance.
If Tua proves he is healthy and shows there will be no ongoing complication (Have no idea how he does that), Bengals might be tempted to take Tua with longer success, and better anticipation.
Same could happen with Herbert, considering how good he looked in the Rose Bowl and Senior Bowl. Herbert is a very special physical speciman that does not come along that very often...The Bengals could fall in love with the big arm, great athleticism, and big body to give and take punishment.
Even I would not be very upset if Miami picked Herbert, if Tua does not prove he can be a long term answer.
This is going to be a very exciting off-season with a lot of question marks, very little is 100% Guaranteed.