To concentrate 2/3 of your army on a peacefull frontier against of formidable army of 72.000 men, and withdrew 5 out of 9 divisions fighting the Turks - prolonging the war for 2 years, one year before any move of french force to east Germany, is a bit aggressive.
And generally, armies are concentrated on battle front - Turkey or in garrisons, all over Russia, to simplify the logistic. Not on nonexistent western front.
I consider Sokolov having a pro-Napoleon bias, but his assertion are always supported by first hand documents, mostly from russian archives.
So probably you should buy Sokolov, even to disagree with - after all, I bought Coppens (and disagreed)