At level 6, if you have a Chosen Warlord, you can fit in 6 Warlords with Pyke. This would be ideal, but if you don't have a Chosen Warlord, you should roll to find one ideally.
Additional comp tips
Before you find Azir, you can run any Warlord unit like Garen or Vi. In the late game, you can look to run Sett and Vi over Nidalee and Jinx.
At level 7, the best unit to add would be Aatrox, but you can use a Sharpshooter like Teemo or Jinx to pair with Nidalee before you find Aatrox.
Katarina 3 star is the main win condition of the team, so don't try to hit level 9 and instead look to slow roll at level 8 for Katarina 3. Another win condition is to go for 9 Warlord if you have a Warlord Spat. This item can go on a strong unit like Riven or Sett.