I don't think it's fair to say that you played a reserve team and we didn't.
Mitchell, our U23 team keeper in goal. Chris Baird starting only his second game of the season. Bradley Johnson recalled after having a stinking start to the season and getting injured/dropped after the last EFL cup round. Weimann starting his first game after injury. Bent back in the starting line up. Bringing on a 19 and 18 year old in the second half (game had gone just after half time). Also, our two main summer signings were both unavailable for selection. Hardly full strength there, which isn't saying much at the moment.
I think your "reserve" team with Firmino, Coutinho, Origi, Henderson, Clyne etc. cost more than our entire squad, which isn't cheap by Championship standards.