Sky Skipper was pre-Popeye & Donkey Kong so after the failure of Radarscope Nintendo probably got cold feet releasing it in the USA. Much like Radarscope cabinets became Donkey Kong's, Sky Skipper cabinets that could have made it to the USA became Popeye's. Parker Bros, to me, was like Coleco, licensing quirky arcade titles that Atari and possibly Coleco to an extent, didn't want or didn't think would be big sellers. It sounds weird about Coleco with them at the start snagging licenses like Lady Bug, Looping ( a personal favorite) and Space Fury but hey, either way we got them. Parker Bros. had a very successful run of great games over multiple systems. It's kinda sad they don't get much credit these days.