I think this loan is seen more as a taster for both Weymouth and Ed to see what level he is at before deciding whether or not to continue the loan for the rest of the season. Physically, he's at a stage where he could play at that level, no problem.Big step up for Ed, and a tough challenge to get game time. If he plays and does well there it will be a big achievement and augur (immensely) well for his future.
Weymouth are in National South, the 6th tier. That's 3 tiers higher than Saltash where he went on loan in August.
Its also a tier higher than Alfie Pond went to (Tivvy) at a similar age/stage. And Alfie's initial loan there wasn't generally judged as that successful.
( therefore I wouldn't be surprised if this loan turns out to be a bit too early/ambitious )