I suspect much revolves around the suggestion (not confirmed anywhere that I've seen) a couple of months ago that Owlerton had been sold. See the Sheffield 2025 thread for those posts
It sort of reads that way, as Zagar is ineligible they couldn't redeclare with him in the side. I'll be amazed if we see him again though
Whatever their options they've replaced a heat leader and a reserve with 2 reserves
They'll beat Oxford with the current set up.
If Zagar isn't coming back then they've a problem finding another heat leader. Might be a Sheffield type double change which wouldn't be exciting and wouldn't likely make much difference overall