If they buy 48 Yonge, (or if already own it and I am unaware) they would have a decent sized assembly for an 88 Scott sized project I think, although perhaps being closer to the CBD, they are thinking larger now. Pure conjecture on my part here though.
I hope we don't see 60 Yonge assembled with 48 Yonge and everything in between even if it means a shorter tower. Personally, I hope 60 Yonge remains a small, lower class office building. Squeezing appropriate sized towers into the existing urban fabric is what makes our city cores unique.