Re: What if ......
Sasori and Deidara would've won.
Naruto and Kakashi were unable to kill Deidara, and Sasori is superior to him. Sasori's poison would easily take Naruto and Kakashi out if they did not have antidotes. Sasori had multiple weapons that should've been able to kill Sakura and Chiyo easily, and they could've taken out Naruto and Kakashi at the time.
Deidara would easily outmatch Chiyo and Sakura, Deidara is a long range, airborne fighter. A bad opponent for the likes of Chiyo and Sakura. Deidara could spam bombs and if needed, use C2 for an easy win.
Only reason Sasori died and Deidara didn't manage to kill anybody was due to plot.