A good signing getting Walmsley to a 5 year deal.
Secures him to you, perhaps, if he does go to the NRL after playing well then you'll get a hefty fee.
Haven't seen too much of Swift but he does seem pretty good from what little I have seen.
James is probably a back up in case of injuries.
The props he's behind are Flower, Taylor, Dudson, Crosby & Pettybourne. Clubb can play prop too although I've always seen him as a direct replacement for Hansen as a right sided 2nd row.
FWIW my top three this season are Huddersfield, Saints & Wigan in any order.