When future Chris and Wyatt see Grams, Chris recognizes her. However, Wyatt does not. This clearly indicates that all future visits from Grams stopped after the final battle, so why did Chris recognize her? While we know that he met her during season 6, that Chris (the one from the dark future) died and was reborn into a different world where his life turned out different. Therefore, he should not have had any memory of any of that since the future changed and it never technically happened, meaning Chris, at least that one, never came back and should have had no more knowledge than Wyatt.