Err...
With no Decoy Force to "decoy" Halsey, he keeps the Third Fleet in the vicinity of the Philippines and uses his aircraft carriers to give the Combined Fleet a good kicking while it passes through the Sibuyan Sea. Then he forms Task Force 34 under Lee and orders him to pass through the San Bernadino Strait and mop up what's left.
A very good point, if the IJN kept its forces together then the USN would too and there's nothing to draw them off. The USN is not going to go "Sir, they are massing their fleet and keeping it together as they advance, what's your plan?"
"Send our carriers running off many many many miles away to a patch of empty seas so they are out of range of everything."
"Umm...."
If the IJN kept all its carriers and BB's together (which is going outside of their doctrinal approach of wide spread units acting in concert, something they'd adopted and refined in the 20s and 30s and clung to like a lunatic throughout the OTL WW2, so such a direct approach is highly unlikely) then the USN will keep its carriers and BBs all together as well and then just drown the IJN in aircraft. And if they keep pushing forwards there's going to be lots of fresh battleships, cruisers and destroyers all waiting for them.