We play a system with 2 strikers, we don't really need more than 4 dedicated strikers for that. If anything the squad is too bloated with Long and Obafemi still here.
Armstrong is clearly not the Long replacement, Long wasn't even in the squad for the last part of the season Ings was here to require replacing. Armstrong is the Ings replacement. Tella has been more effective as a striker and Broja hasn't joined on loan to not make the squad due to us signing another striker.