Rick, My paid research a number of years ago indicated that the Nicholas Ribble [Nicolaus Ribbel] who died and was buried in 1786 was only 33years old according to the records of the First Reformed Church in Philadelphia. That would logically eliminate him as our immigrant ancestor. The same church records show a Nicolaus Rubel, age 66 buried on March 11, 1777. That Nicholas has a slight name-spelling deviation and a two-year discrepancy in age compared to the Harle's record of our ancestor's age when he arrived in Philly. He's a possibility. The other Ribble buried in 1785 [Nicklaus Ribel] has no age listed and thus is still the other possibility.
That doesn't solve our long standing dilemma but it does eliminate one possibility.