Playing a commando heal myself I can say I have no problems healing with a sage or a scoundrel at my side. Two commandos on the other side - is very tough to do.
Pretty much every combination of healers is viable in Ops, even 2 sages or 2 scoundrels except 2 commando healers. I think that pretty much says it all.
I'd accept that challenge. I'll come heal with you and we can see how good we go.
I'd love to run 2 Commando's together FTW!!