Two of them start at both10 and 15, with the other on the bench, all getting good minutes every week. Can mix and match as well. Issue next year is where Beale slots in... Always injury opportunities at this level, so generally one of the 3 would be on light duties at any given moment. Edmed has a pretty solid physique and could easily handle 12 as well. Plenty of opportunity to play all 3 IMO. It's the other blokes on the fringe that may well miss out..
Tahs could look something like this...
Gordon
Edmed/Donaldson
Nadolo (so the word on the street says)
Beale / Edmed
Foketi
Perese
Harrison
Grant/Robertson
Edmed/Donaldson/Beale
Mark Nawaqa / Ramm etc.