I don't think we know enough about the Swords to say that, There are ranks even among angels, I don't think the one guarding the elevator in Colin Murphy's office building is Uriel-class. Yes, Uriel could have walked across Lake Shore Drive and said "Invasion is off. Go back home, or I will make you. " Michael? Sure, he could too, or Gabriel. If they all had that kind of power - why would there be a dozen at the Carpenters' ? One would be plenty.
Because at some point Uriel is aware of a threat to the Carpenters which WILL require the intervention of dozens of Angels which means:-
(1) a direct attack by Lucifer; or
(2) all the Fallen in the Denarius get simultaneously released from their coins.
Sounds like the BAT to me.
The attack in Skin Game was mortal Humans in Nickys employ, the attack by Ethnui ditto. The Angels could do little in either case, so they are there for an anticipated attack where they will be useful.
That means Michael probably has more significance to come rather than as a mentor to Harry and the Knights, and Jim has been lying to us (yet again).
Michael Carpenter becomes the White God? Or at least his living Avatar. Was Uriel lending his grace to Michael foreshadowing of this? Michael didn’t explode or go mad in containing such power.