JT
This is just my theory.
It doesn't fit.
ROTS script
YODA unleashes a ferocious assault on PALPATINE, causing him to almost go over the edge. The Dark Lord drops his lightsaber but recovers with a BLAST OF ENERGY from his hands that surrounds YODA. YODA is deflecting the Sith Lord's lightning bolts.The energy bolts begin to arc back on the Emperor. It looks as if the Dark Lord is doomed.
YODA: Destroy you I will, just as Master Kenobi, your apprentice will destroy.
If your theory is based on the notion that Yoda realized destroying Palpatine would only make the situation potentially worse, then why would release Palpatine and then vow to kill him right after? Motivationally speaking, it makes no sense for Yoda to conclude that the duel is pointless and then continue fighting it.
ROTS script
YODA jumps to a lower Senate Pod. PALPATINE reaches out with one hand, and a Senate pod is released from its mooring and heads toward the Podium. PALPATINE uses the Force to hurl pod after pod at YODA, who ducks and jumps from one flying pod to another.YODA leaps away from the pods. He uses the Force to hold one pod suspended in the air. The pod spins and YODA throws it back at PALPATINE, who leaps away at the last moment.
YODA leaps after him, but PALPATINE quickly turns and aims the full force of his energy bolts at the tiny green Jedi, catching him in mid-air and throwing him back hard against the Podium. The force causes YODA to drop his lightsaber. YODA blocks the lightning and throws PALPATINE backwards off the podium. YODA is knocked off the Podium and falls several hundred feet to the base of the Podium. PALPATINE follows in his pod, searching for YODA.
I direct you to the 4:15 minute mark of this video. Yoda is seen leaping from what appears to be the Chancellor's podium to engage Sidious, who is a notable distance away, with Senate pods at the ready. Yoda's and Sidious's physical locations do not match the duel as portrayed in the script, in which it is Yoda who jumps from the podium to a lower pod; Palpatine remains in the podium until Yoda hurls a pod back to him. The movements and decisions/motivations of the characters don't match what we see in the film.