Actually, my little bits about strengths and weaknesses in Reshevsky's game, come straight from Kortschnoi's pen, as I reminder it.
In one game they played together, Kortschnoi was outplayed till around the 25th move. Then, he made the following commentary: as usual, Reshevsky played with incredible strength the first part of the game, but was quite short of time for the rest of the game and Kortschnoi knew that the practical strength of Reshevsky's play would decline from this point on. And it so happened.
(Told from memory, but in essence it amounted to something like that)