I think you have the correct perspective. Blue in BC, bless his heart, seems to get vapour-locked on the how the new nationalized players interface with the DI designation. We've been around the mulberry bush on this issue awhile ago. To be fair, the league hasn't really spelled out how this works from a procedural view, so there are some leaps in logic and assumptions that need to be made, and we will have to see how it works in practice.
My own theory is that teams are likely to use the new status players in positions that already see a high degree of rotation and substitution. I think this will happen through "triangulation", using 3 players to fill 2 positions. Example will be the MLB and WIL positions. The Bombers could designate Bighill as a nationalized CDN and DI and use him in rotation with Kyrie Wilson and Gauthier.
Why would we sit Bighill? We already give him regular rests in the defensive rotation. In this 3 person example, let's assume (for purposes of easy math) there are 100 defensive snaps in a game. Between MLB and WIL there are 200 reps available. We need to play Gauthier for 55 snaps for him to count as a starter. Bighill, as the DI/Naturalized can play 45 snaps, but he can also come in as a sub for Wilson, for say 30 snaps. That scenario works out with Bighill at 75 snaps, Wilson at 70 snaps and Gauthier at 55 snaps. So, counterintuitively, Bighill plays the most snaps even though he is the DI.
I could see a lot of teams using this approach at DE, although in the Bombers case, I don't see the Cdn DE who makes it work. On offence, I think the two-man platooning between Janarion Grant and Wolitarsky is most likely, although I would not expect it to get a ton of use. Grant hasn't established himself as an effective downfield receiver, and since the Bombers tend to use their DIs on defence, I don't see them adding another one to the offensive side.
I could be wrong though....
You have a lot of theories including that you could be wrong. Hence the discussion.
The idea of platooning the MLB and WIL position is somewhat interesting since we did that a lot in 2022. Although that was due to Wilson's injury for part of the reason.
Bighill is probably in the top 3 SMS's on our defence. Where to draw a line between needing to give him a rest or doing in order to platoon is a different conversation.
Gauthier played better in 2022 than I thought him capable. Briggs did the same in 2021 at WIL. Realistically I don't see us intending to rotate more at MLB or WIL as you've outlined.
Keep in mind those are in game situations but don't necessarily resolve a longer term injury at MLB or WIL in the example used. In your example for these roster spots someone like D. Lacey sitting on the PR or 1 game IR is a resolution in " theory ". Can we sign him for that role at an SMS we can afford? Probably not but it's the kind of situation I see needed to address. The longer term replacement for any position needs to be on the roster and able to practice with the team.
You don't bring a player in on Thursday and start him on Saturday / Sunday. He has to be into game condition and practice etc. I've suggested several players that could have fit the bill for both a DI and a Nationalized player. It's not unusual for the Bombers to have a DE or DT as a DI. Lemon or Coleman fit both criteria. The fly in the ointment is SMS hit and willingness of those players to accept that role.
The league does need to clarify this more. Regardless it's an interesting conversation about how we think this will work and why.