Possibly trying to make the point that we can win without 1 sub let alone 5, so it actually would be more for fitness than tactical.
He wasn't trying to prove a point, he was trying to win a match which seems to have been forgotten about in all the debates around 5 subs.
We had next to no options on the bench that would have improved our side or given us something different to help us win the game and even from a fitness point of view, look at the options we had on the bench and which first 11 players needed resting. The front 3, Jones and Trent didn't need resting - they've all had periods out, either enforced or otherwise and our front 3 are proven to be highly durable. Putting Origi or Miniamino on neither solved any fitness issues we had nor improved the side. Had we been 3-0 up then no problem, give Mane 30 mins off but with the game in the balance you don't weaken your side for a marginal fitness gain.
The players that need resting are Hendo, Gini, Fabinho & Robertson but we had little or no options on the bench to rest them. Neither Ox or Keita are going to play holding roles in midfield and both are no where near fully fit - Ox has only just returned to full training having been out since last season and Keita missed the weekend game having suffered a recurrence of an injury that kept him out a few weeks. And you're not taking Fabinho and Robertson off for Phillips and Neco Williams.
Hopefully we're going to be in a better position moving forwards. Klopp said in his press-conference today that Thiago, Milner and Shaq could all be back in full training next week, throw in an extra weeks training for Keita and Ox and we'll then hopefully have more first team options that will allow us to make changes without sacrificing results.