I might think the European specialists would benefit from work that was done in the 70s and 80s about the Iroquois expansion into territory held by "Hurons" -- Algonquian speakers -- and the Iroquois had an organizational advantage, not a mobility one or a toolkit one. All three would presumably work better still!

(Though I would be very curious if there's anything more recent about better access to wool blankets!)

And yes, the whole "what, you mean the Yamnaya hypothesis is plausible?" thing is still up in the air but I think that's in large part because it's the true heir of Gimbutas' Kurgan hypothesis and has immense political baggage.