I wouldn't go as far as to say they're unique, but I would say they're the exception rather than the rule but one thing is for sure they're inconsistent in performance, something indicative of a lower League player. They've both had a good few months during this season, but as for them doing it consistently only time will tell so I wouldn't be offering either of them a 5 year contract on what I've seen this season. How many players (especially strikers have we had come in over the years who haven't cut it coming from a lower division. According to SL (and Kettners with his thread on it) we have been putting decent balls into the box recently (crosses that he was quoted as saying he'd have loved as a striker) but no-one has been on the end of them. I wish it was all as simple as you make it sound, Parkers individual performances recently have been toilet ( and he's by no means alone in that) but I'm still not convinced that either Eaves or Parker will replicate their scoring form of this season again next season regardless of chances created, but that's just a hunch. Eaves has done well this season and better than I expected (Parker to) but he's a nuisance rather than a quality finisher/ regular 20 goals a season striker IMO. They've also both had games and runs of games where they've shown exactly why they've come from league two (poor touches, no vision, poor passes etc). If Eaves (or Parker for that matter) turns out to be a consistent goalscorer at this level he won't be here long, because someone else will pay him more.
Eaves has missed as many chances with his head as he's scored this season, but IMO the bigger picture is trying to get better quality into the squad/team all over the pitch, but that requires investment. Players playing at any level are usually there for a reason, because its their level with the odd exception, the odd exception then get plucked to play at a higher level and that applies to a player playing any position from goalkeeper to striker.