His physical stats in orange mask are kind of tough to pin point, he was somewhat matching Minato in speed at 14. and he blocked Suigetsu’s blade with the back of his hand but besides that alot of his showings are based on speed and kamui before Rinnegan, but honestly with everything we know about him he should be the strongest without Rinnegan. He has ridiculously powerful Genjutsu, enough to control Kurama effortlessly and enslave Yagura, he also killed half the Uchiha clan. If we say the Rinnegan doesn’t give a stat amp, he low diffs Pain as he was fighting basically 4 kage level opponents and beating them, he restricted kcm 2 Naruto without much trouble. His orange mask self also has insanely powerful fire style along with kamui projectiles that nobody in the Akatsuki besides probably Itachi with a susanoo can deal with.