Diamondtear (as every other main - holy I know) has gone after 2pc T10 because of the setbonus ability to largely mitigate the impact of one divine plea every three minutes. I would be shooting for that, too. Problem for me is (and maybe for her setup was) that the tokens go to my tankset (in her case to Lazeil's that is) and as long as that isn't finished the T10 pieces are sub-par to the offset pieces except for the godly setbonus.
In short: I would shoot for the T10 2pc anyway. Manareg > all