Not so. Over his 18 years at the Mosconi Cup, Shane's record is actually a bit better than the aggregate record of the other players on those 18 USA teams:
https://forums.azbilliards.com/thre...yed-on-either-team.464772/page-4#post-8007067
For singles and doubles matches combined, he was in more wins than losses in 8 of the 18 years, more losses than wins in 8 years, and an equal number of each in 2 years.
Here is Shane's Mosconi Cup Record in matches won and lost each year -- Singles, Doubles
2007 -- 2-1, 1-1
2008 -- 1-2, 0-2
2009 -- 2-1, 1-1
2010 -- 1-1, 1-2
2011 -- 2-1, 1-2
2012 -- 1-2, 2-0
2013 -- 0-1, 2-0
2014 -- 0-3, 1-2
2015 -- 1-2, 2-1
2016 -- 0-1, 0-3
2017 -- 1-1, 0-3
2018 -- 2-1, 2-1
2019 -- 2-2, 3-0
2020 -- 1-2, 0-3
2021 -- 0-4, 1-2
2022 -- 0-2, 4-0
2023 -- 1-0, 1-1
2024 -- 0-1, 0-2
Totals -- 17-28 (winning percentage 38%), 22-26 (46%)
In the Team matches for those 18 years, Team USA and Team Europe each won 10 matches.