Enforcing collaboration via grant review

I am wondering whether anyone else is noticing any trends for prioritizing multiple-lab NIH grant proposals.

I recently got busted on, somewhat randomly given the proposal, for not including enough other faculty level investigators. At the time I shrugged it off as an annoying hobby-horse issue of one reviewer.

But Multi-PI proposals have been going over well for some time now, from appearances. So perhaps it is a trend and study sections will start punishing single-lab grants?

I am not sure what to make of this, should it become a trend.

The comment I received smelled to me like “why are you not bringing your junior faculty along for the ride?”…bu perhaps I am over interpreting.