I assume by Holder you mean Chris?
If so, didn't he ride for IOW for two (+?) seasons before moving up with Poole. Although if my memory is right, there was a grey area that Poole paid the flight costs etc. so IOW could train him up first
Darcy was purchased from Kings Lynn having had a successful spell with them in the lower division
So neither literally landed in UK and went straight into the Poole side, they gained experience elsewhere first. Whereas Tony Langdon, Leigh Adams and Craig Boyce all started at Poole in what was then the National League back in the 1980s
Please feel free to correct me on any of the above or add further info (on the off-chance it was all a strange dream!)