I'd like to see Vesey/Engvall/Boyd/Petan all rotated in an out for each other while we wait on Simmonds and Roberston to make their way back in.
Nobody else is ready to make an impact right now imo. Sabourin in makes no sense at all.
The issue is waivers. It is easy to rotate Petan, Boyd, and Spezza since they've cleared waivers, but Vesey and Engvall both require waivers and they have done well enough that there are some teams, especially teams with injuries, would probably consider claiming them.
They will probably rotate Robertson with Petan and Boyd until Robertson proves he deserves to play every day (which may not take very long) or if Spezza needs a break and the Leafs try Engvall down the middle for the odd game. Leafs could also call up Brooks for the 4C spot once in a while too I guess. Barabanov is on the outside at this point, so I expect him to get moved, and Sabourin should not even really be considered at all.
Boyd and Petan are nice options for a taxi squad, and they make Barabanov expendable, but I don't think it is a high priority to get them in every game. There will be enough injuries that they will get their fair share of games this year.
We can worry about Simmonds coming back in a month from now when he is closer to entering the lineup. A lot can change in that time (injuries, trades, etc.).