The success rate of ESL imports in the NRL is mixed.
The Burgess boys and James Graham are obvious standouts and generally have justified their high asking price (although Sam's second stint has been poor by his past standards).
For a club to be willing to throw top dollars at a marquee player moving across the globe, the player needs to show a genuine desire and commitment to all aspects of their journey.
Homesickness is inevitable, some people just handle it better than others. It's two-way street and the club as a whole needs to embrace the player and their family, giving them the support they need to settle into a new home. You can't expect someone to come and excel without that. Rusty, Souths and their supporters no doubt gave the Burgess's that, the way Sam played he looked like he'd been a part of the club since he was a kid.
Walmsley could be anything, but he needs to want to be here for reasons beyond stating it's either now or never. I hope he gets to showcase his talent on a weekly basis, and if at his peak that it's at the Knights. The first half of this season will be key, if he signs early and goes off the boil it'd make for a nervous club wondering what he'd bring into 2019. i'd hold off making a big offer until these points are clear.
I'm sure there were lessons learned through the underwhelming Wardle experience, I'd be surprised if Walmsley is an example of history repeating.