It was an afterthought, if I'm reading you correctly. If you want my summary of someone else's research of the hearsay and such: WED had no intention of putting Pirates into WDW initially. Florida was near the Caribbean; it wasn't really novel for where WDW is. They were going to build Western River Expedition, considered by many of us nerds to be Marc Davis's unrealized masterpiece, where BTMRR is now. It was basically "POTC, but cowboys" since the Western Frontier was more "exotic" for lack of a better word.
POTC was built in a bit of a rush after the park opened because people were asking for it. At the time, WRE was still very much intended to be built, so Marc didn't want POTC to compete with it. He redesigned POTC to make a shorter, faster, less atmospheric version. My read of things is that his intention was to fit all of the vibes and such into WRE.
WRE got scrapped due to a combination of factors: POTC taking some of the budget and being similar, the Energy crisis, and Tony Baxter apparently doing some politicking to get his ride BTMRR built on the same ground. I'm not saying Tony killed WRE, mind you; some people like to rag on this person or that. But the point is the ride was killed by a thousand cuts, one of which was the half-baked POTC that was built.