Clemons - Maton was a wash, Maton has more upside but Clemons a better skill set for a bench player (LH power off the bench).
Sands can probably play in the majors, a Coste type who probably doesn't field well enough to start at catcher and doesn't hit enough to start at 1B or DH, but who'd be a useful bench piece.
Even if Vierling turns out to be a 20 HR, starting RF with plus defense, which would be a pretty valuable player, Phillies will be starting 4 OFs in LHV, two with similar skills sets (De La Cruz, Ortiz), two who are true CFs (Rojas, Muzzioti). Since there's no spot open for Vierling at the corner until one of Castellanos, Schwarber, Harper and Hoskins moves on, he'd be a part-time player this year. And next year he'd be competing with one of those kids for a starting job - and if the Phillies drafted right, Crawford/Boyd and a couple others would finish next season in Reading.