Yeah I don't honestly know where he winds up and it's really hard to say. There's not much out there, he has a small sample size of 15 career starts, and based on that it seems he's written off by most of the websites I've looked into, including NFL Network and PFF. Not to mention it is a pretty stacked QB class, it's just naturally easy to overlook him. If I were to guess, one of the handful of teams that worked out with him and liked what tehy saw might take a late round flier on him, but there were scouts and/or coaches representing all 50 teams at the TA&M pro day where Allen was said to have looked sharp. I just don't know. At the very least he should be a priority free agent, but it's possible he could go as early as the 6th round.
I am not worried, yet. If he is not throwing by training camp, though, then I will start to get a little bit apprehensive. If he is not throwing by the middle of training camp, then I would assume that he will not play in 2018. For now, though, I am optimistic that by the time training camp rolls around, all doubt will be put aside.