Simple answer is I don't know.  The consistent figure across the reporting is 22 x BTGs up there.  Both Jomini and UAWar appear consistent about the formations up there.  A lot I think depends on which 22 x BTGs are being counted - if you track from Verbivka to Sievierdonetsk you arrive at 22 x BTGs.  If you look at the formations and work on the widely held view that that a regiment/brigade is capable of generating 1-2 BTGs then the 8 x regts/bdes in the area Verbivka-Pidlyman translates into e