You can’t really argue with that, if he scored 5 goals but they lost 4 games then the defence are not up to the job.
I’m used to that as a Wales fan. We’ve always had world class players for all the time I’ve been watching, Ian Rush, Mark Hughes, Ryan Giggs, Gareth Bale etc but usually surrounded by 3-4 decent players and the rest as lower league journeymen. That probably won’t change much as we are so small as a country.
In any team sport you can’t insert a superstar and expect great results, they can’t carry teams.