I heard during the week that JD said that Souths so far haven't managed to find anywhere to train in Vegas for the lead-up - I assume they resolve this, but might suggest those 4 teams might be just a little underdone.
Allegiant Stadium will only be 63 metres wide (standard NRL stadium is 68m) and 96 metres end to end. That's a 752m2 reduction in playing area (about 11% smaller game area) - it's possible they may be able to eek out a couple of extra metres IF they feel it won't impact player safety...
But if it stays at those dimensions it's a pretty significant drop in playing area and it makes me wonder if it's going to really shift the games into quite a middle orientated grind fest as shifting it wide should be easier for defensive structures to combat.
That might be good for the likes of Haas, Carrigan, Murray et al, but not so good for OSBs and fullbacks; Teddy, Walsh, Turbo (I'd say Latrell, but he doesn't like big distance running anyway haha).
So maybe in that first week those OSBs get a slightly slower start than otherwise projected and the middle gets a bit more work (noting also the average high in March is 22 degrees in Vegas, compared with the usual Australian heat wave to start the season).
I'm not suggesting it should be cause to rule a player out (it's a long game after all), but it might help decide when split between two players?