Sorry, but this language seems a bit contradictory. You say picks must be entered prior to the Thursday night game and prior to the 1 PM Sunday games - that would imply that you always must pick before Thursday's game (no matter which game you are choosing).
I assume you mean that if you are picking in Thursday's game then you (obviously) have to make that pick before that game while if picking a Sunday or Monday game you must pick by 1 PM Sunday. And that is fine, just as I said, I think the wording is a bit contradictory since you say that you must pick before Thursday AND before Sunday which would collectively mean you must pick before Thursday no matter what (the latter thing would be irrelevant).