Who would you open with if they had bought Rossco in?
TBH, I don't think Taylor is a great T20 player, they have KW for the anchor role, and 5 other guys around him who hit at a big strike rate. Rossco can take a bit to get going, and doesn't have the 6 hitting he had in his mid twentys. That's not a bad thing, he's far better churning out runs in other formats than previous.
Sounds like bad communication to Taylor though, I'd tell him that a one off T20 is ideal for young guys like Bruce and Phillips to get international experience, don't take any offence, you are a top player in ODI's and Tests, which is far more important.
But then they select Brownlie over Worker for the one dayers, which completely ignores the age vs promise thing.. Confusing bastards.