McGlinchey could have been a late 1st rounder based on his size and testing but his film from last year isn't all that impressive. His 2015 film from RT was much, much better. If he settles in better at LT this year though he has a chance to be a mid 1st rounder next year.
Nelson needs to improve this year too. Guards don't get drafted nearly as high as tackles so 1st round would have been a big stretch for him this year. He's not at Chris Watt's level yet and he was a 3rd rounder.