Heres a simply change to make Teutons useful. Give them HMG with NCO. That would give them a role to play.
It was a bunch of Santiagos with Magisters, but there was an Order Sergeant around, which made them all Teutons!
Nah, they make great count-as Teutons that link with Santiagos and OS. It's not like anyone is stopping you from running a pure Magister link you know. Not that it wasn't a gimmick before, an ML/Panzerfaust bunker or a 110+ pts "warband".
My (Old Sculpt) DeFersen is going to get painted up as a Santiago. Father-Officer Gabriele de Santiago.