My RB so called situation

So I have 4 decent RBs for week 15 I have Mark Ingram, James Connor, David Montgomery, and Deandre Washington. I will most likely use 1 in my flex since it’s a non ppr and my WRs don’t have as much potential I feel (Edelman, Tate, and Debbo Samuel) so which two should I start and who should I flex? I think it also depends if Lamar Jackson plays because Ingram should hopefully get more plays then? Idk it’s against the jets though. Thanks!