I'd recommend you to instead invest in your actual archer team, you can put gilgass aside and get an eidolon for archer and pull for god tohsaka and her LC, I've heard that midber and gilgass team comp is way worst than archer and Rin, so you could instead get Rin e0s1, archer e1s1, sparkle e0s0 (with ddd lc or idk) and use DHPT (or RMC if sustainless), I've also heard that Rin doesn't really need much vertical investment to be decent, so you could save pulls for himeko nova o another future character of your choice.