[rink23]

I have a fictional team (St. Louis River Walkers) in a fictional league (Midwest Baseball League) that uses real (2018 season) as dispersed through a draft.
I'm in the 2019 season, dominated the league and won the championship in 2018 and should at least have the best record in my league in in 2019. We're in early September.

My top prospect is Bo Bichette. IRL, he's the Blue Jays No. 2 prospect behind Vladdy Jr.
His strength is his bat, and position wise he's a second baseman and shortstop.
I already have a 5-star second baseman on a long-term contract.

In how I run my team, Bichette's glove doesn't rate as a starting shortstop. I want an at least a 65-rated defender or a 60 with a Machado type bat. He checks in at 45.
Due to that I'm thinking of moving Bichette to third base. He has no rating there, but his range (60) and error ratings (55) are both better than my current third baseman (Nicky Delmonico). He's at 45-50.
Only in arm strength (55), does he seem to lack. Delmonico's is 65.
The plan is to groom him for the 2021 season.
Delmonico has done just fine -- he's currently hitting .268 with 28 homers and 88 RBIs -- but I think in the long-term Bichette's bat will play much better.
In the 2020 season, if I would use him at third in spring training and in AAA give me an idea of how that might play out?
Also, when it comes to spring training, if you do not play someone like Bichette in the actual games -- does the game put him into backfield games just to get him reps?