The Brazilian playmaker once again pulled the strings for the first-year MLS side who dominated in the second half to produce a 2-0 at the Citrus Bowl, taking their home unbeaten streak to six matches.
Cyle Larin opened the scoring in the 62nd minute before Kaka added a second three minutes later and his performance was certainly not lost on O'Neill, whose defence spent a lot of the night attempting to mark the former AC Milan and Real Madrid star.
"In the first half, we were pretty solid," said O'Neill. "In the second half, we took wave after wave of pressure and couldn't seem to get out.
"Kaka was the cog, creating everything. He made life difficult for us.
"That's the thing. It's not as though you're going against a lower league side. They have really some really quality players."
The win allowed Orlando City to remain third on the Eastern Conference table while the Rapids sit bottom of the West having saluted just twice in 16 outings.