I'm going to be the devil's advocate here.
This is possibly well-intentioned advice from Jeggo, but Kuol has demonstrated a lot more class as a forward already for the Socceroos in international football, than Jeggo has as a defensive midfielder.
Jimmy's advice about Scotland may be sage - probably meaning the depth of competition for places in any squad in Scotland is tougher than Aus.
However, the point stands. Scotland has not qualified for a World Cup for 6 successive campaigns. This time in the Qatar campaign they were easily swept aside by Denmark, in the UEFA WC Qualifying group.
Comparatively, Australia drew with Denmark in the 2018 WC in Russia, and beat them in the Qatar WC in 2022.
In the Qatar Socceroo squad that reached the last 16, a third played in the A L and another third started their career in the A L.
Given the class I've seen that Kuol has already displayed for the Socceroos, and recognised by far more renowned coaches than me, against infinitely superior opposition to most Scottish clubs, it is a case of Kuol finding the right environment, the right coach in the right league, with appropriate game plans, for him to excel.
Scotland is not a successful paradigm for international success. How many players ply their trade in Scotland, including the Old Firm, Rangers and Celtic, outside Aussies, who have made the last 16 of the Qatar WC? Or any WC? Did any other Scottish league players, outside Aussies, play in Qatar, Russia, Brazil or South African WCs?
How many coaches in Scotland, outside Ange, have been senior or assistant coaches at any World Cups?
Sadly for Jeggo, he made one of the the most horrendous mistakes, due to lack of concentration, in the entire Qatar WCQ campaign. He almost jumped at and handled a ball to concede a soft, late penalty to China, when they were gone for all money. China snatched a draw against the Socceroos, after being totally outplayed.
How could a player, Jeggo, with all that supposed experience, make such a stupid mistake? It almost derailed Australia's entire WC campaign. Arnold never selected him again.
Jeggo might be doing well in Scotland ATM. However, he has been found wanting on a bigger stage when it really counted. Even if he hadn't made that mistake against China, Jeggo has been overtaken by a squadron of better, younger players in defensive midfield, screening the defence and starting offensive build ups.
If Kuol has succeeded, admittedly in a few cameos for the Socceroos, against far higher quality opposition than anything in Scotland, he can succeed in the right European club environment.