I think it's possible Tregs could be a solution, or at least a major part of one. As Dr. Cole said elsewhere, it's valid to try a different alternative when nothing else has really worked.
Let's take the examples of Dr. Gho, Intercytex, and Aderans as researchers who have injected cells into people's scalps, but HAVE NOT been successful in developing a commercial product out of this idea.
When a new cell-based discovery comes along -- like Tregs and their role in hair growth -- then it's entirely valid to ask, "What if Aderans didn't work because they should have been injecting DP cells AND Treg cells?"
Now, of course, nobody knew about the role of Treg cells in hair growth 5 years back when Aderans was still doing trials. Maybe if they had added Treg cells to the cells they were already injecting, they'd have gotten much better and more consistent hair growth. We really don't know, but it's definitely something worth researching now.