The teamwork thing is a myth. It is in singles that the US has consistently played itself out of Mosconi contention over the last dozen or so Mosconi Cups. Not a lot of teamwork involved in singles. Actually, the record of the US is much better in team matches than in singles.
Last year, it seemed like the US was giving up 50 Fargo points on average per match. There's no amount of teamwork that will cover that spread.
This year, the US may well be up (Fargo in parentheses), against Filler (836), Gorst (827), Sanchez-Ruiz (825), Shaw (819) and Ouschan (821). On paper, this looks very one-sided, even if the five members of Team Europe all give each other the silent treatment.
As one who has attended many Mosconi Cups, I can't say I've seen more teamwork in one team than the other. On the other hand, the European fans exhibit a level of support and enthusiasm for the event that is otherworldly, even when the event is played in America.
Does home field matter for Team USA? For prestigious events having good prize money, I'd have to say no for 2022 year to date. At Derby City, Filler won the 10-ball, Sanchez-Ruiz won the 9-ball, and Gorst won bank pool and one pocket. At the Arizona Open, Gorst won. At the Wisconsin Open, Kazakis won. At the Las Vegas Open, Zielinski won. At the World 10-ball, Szewczyk won. At Super Billiards Expo, Shaw won. In 2022, there's little evidence that home cooking is worth anything to American players.
The US can win, but it won't be easy.