I do think this is such an interesting word slip from Sam here re: Jack.
And it's another one of those ways that I think Sam can be so ANGEL-minded.
And like,
Sam has wanted so badly ALL HIS LIFE to be "pure," and felt like such a freak.
Maybe it's no surprise that he reaches for something forceful in order to keep someone else from going through that! (This also feeds my s16 bad parent Sam agenda with Dean II, yay!)
///
Even Cas in the throes of manipulation chose a different word with Jack: path.
A path is something you walk, not something you bend a body to fit. "Mold" is much more forceful.
Cas OFC himself does (like all the dads) fall too heavily into pinning his hopes on Jack /Jack's powers. Cas lapses into struggles with "story" and "big destiny," and fights that to the bitter end...
BUT
When he uses the word "mold," it's as very interesting that he uses it as a lure, to ENTICE another angel to look for Jack.
It's so fascinating, really how Cas plays Dumah...
...by emphasizing the Winchesters' fury... and by using clinical, almost machinistic, language about Jack: "Salvageable."
Cas knows how to slip back into angel's angel kind of talk at will.
(Which imho lends some credence to my theory that, in Lily Sunder Has Some Regrets, Cas wanted to talk to Ishim and company alone, not just because Ishim "didn't like humans," but perhaps because Cas knew "talking smack about humans" might be part of the politics to get the intel.
Lo and behold! Even though Ishim shit-talks Cas, at the very front of the meeting, before Sam and Dean join, there is some light "shop-talk" from Cas: "Your vessels are in good condition." It's like how dudes talk about their cars.
ANYWAY.
This sounds in keeping with that. The nephilim is "salvageable."
This is angel culture. A mad men echo.
Slipping in "molding" with "guidance" is specifically done to entice Dumah.
It works.
