He is the only player who has played in Scotland in the past 10 who would have ever been in a world 11 at any point in their career. I wouldn't even compare Gascoigne to Keane. Outside of Scotland he won nothing and his form was erratic at best - Keane has countless english domestic titles and a champions league as a skipper no less. Gascoigne had more talent than Keane and a tenth of the professionalism and drive. Dalglish is a legend but that is before my time and I have never seen him play. Laudrup and Larsson both were brilliant strikers but were they at any point in their career one of the top two strikers in the world? - Larsson was perhaps on the fringe that one year he almost dragged them to a UEFA Cup but I don't think you'll find anyone who would put Brian Laudrup there, Michael alone was considered better than him was he not?
Just an outside perspective and an opinion at that, I realize that the Scottish soccer scene is very very partisan, I'm not a hardcore Celtic or Rangers supporter (I've always managed Stirling in Champ Man

. Is he washed up? Maybe but Laudrup and Gascoigne while world class players have never had the kind of following that Roy Keane has. He has a profile even across the ocean and to me he is the biggest name in Scotland in 10 years.