That would be awesome.Why not Smith and Parsons. Both are can't miss.
Or if you think Parsons wouldn't last to 18, do some fancy trading. Trade down a few spots for Chase/Waddle, and use the extra picks from trading down to move up few spots from 18 and grab Parsons.
I don't think Parsons drops to #18, but as you mentioned, maybe a trade up if he drops within range.