Despite the conviction of many fans, I do not think the Bills view the DT needs the same way. Interior pas rush is a problem they have been trying to address for years with limited success. Sure, if they were able to land a prospect early who could anchor and rush they might be all over that. As it is, Buffalo had the 29th rated 3rd down defense in the NFL last year. They need better pass rush, especially from the interior.
I expect they are still in the market for 1T they can pair with Jones this year and potentially replace him with next year, but i think they have addressed the more pressing need with Sanders, who could end up playing a large percentage of snaps with Oliver.