This team doesn't have middle or late-inning relievers.
The Phillies don't have room to sign two more relievers though. As it is they are probably going to have to trade or waive someone (though I notice you didn't mention Neshek). If you have Britton, Seranthony, and a consistent Neris, then Hunter and Neshek (or Hunter and a rebounding Nicasio) are plenty good enough for medium-leverage or middle innings (as is Arano, yes). Ramos is still going to be useful too.
Lest we forget, on the SP front, Kikuchi is still out there, and the Boston Globe says we're still sniffing after Robbie Ray.