Let me point out that these 2 rangers are counted in the line up.

The Quantum Ranger (Eric) & Red Samurai Ranger (Lauren)

So if they can be in the line up why can't these rangers be in it.

Red Ninja Ranger (Rocky)

Crimson Thunder Ranger (Hunter)

Wolf Warrior (Leanbow)

These are the possible Future Red Rangers.

Super Ninja Steel Red Ranger

Ninja Steel Red Ranger (Gold)

Ninja Steel Red Ranger (Silver)

Red Ranger of Season 26 (Unknown)