The logic behind it makes perfect sense, if everyone else says or does something, does it make it right? You have to have a set of standards that need to be met in order to qualify for Legend status, not have enough thumbs up by groups of sheep to qualify.
And correct, Ronaldo isn't considered a Legend, he cant be, he took a pay packet from several clubs and went where the money/trophies were. He did it for himself. He didn't do it for the fans or the club. He didn't sacrifice anything. Therefore the clubs he played for cannot call him a club legend. Maldini on the other hand.....one club, his whole career, through thick and thin, didn't flinch once. Legend. You can be as good as all those players you mentioned but that only qualifies you as a "Dutch Legend" or "Brazilian Legend" not a club legend.
In Messi's case you are using another example like the Gerrard one, where he was pictured in a Everton top.....aged about 6. Thats stupid. Messi joined Barca at about 11 years old, went through their Youth system, went on to the first team and hasn't looked back. How can you compare that with Rooney playing almost 70 full games for Everton before he moved to United and probably another 100 now he has moved back? Massive difference.
It comes down to where you set the bar for gaining Legend status, and it seems to get lower and lower. If Rooney is a legend what are the Puyols and Giggs of this world. They are in the same bracket? or is there a higher level? Because as far as I was aware it didn't get any better than a club legend.
That's not what anyone has said though. Kenny Dalglish is a Liverpool legend by virtue of him being one of their best players during a tremendously successful period for them, and later continuing the success as their manager. Rooney is a United legend by virtue of him being one of their best players during a tremendously successful period for them, leading to him becoming the club's all-time top goal scorer, breaking a record that had stood since Bobby Charlton left in 1973. Ronaldo is a Real Madrid legend by virtue of him being one of their, and the world's best players during a tremendously successful period for them, breaking all sorts of records as he goes.
If you think for one moment that Dalglish doesn't have great affection for Liverpool, or Rooney for United, or Ronaldo for Madrid, then you're a deluded fool. A player is a legend at a club if he does something for them that elevates him above almost all others, it's as simple as that. Dalglish did that for Liverpool, Rooney for United, and Ronaldo for Madrid.
It does depend on where you set the bar for 'legend' status, and it's not getting lower, yours is just absurdly high.
As I said, you can hold a special regard for one club men (proper ones, not "I fancy a pay packet in New York" ones), and distinguish those from others due to their loyalty and obvious connection to the respective club. That's fine. To suggest that someone like Buffon is not a Juventus legend because he happened to start his career elsewhere is ridiculous.
How would being a club legend be the pinnacle? Being a legend of football is the pinnacle, where your status as a legend is respected regardless of who you played for and where you played (see Pele, Maradona, Best, Beckenbauer, etc.).
Every single football club will have club legends, from Accrington Stanley to AC Milan, from Bangor City to Barcelona, whether their peak was playing in a regional division and having one cup run, or whether they won back to back European Cups. These legends are not determined by who they played for before, who they grew up supporting, or where they went afterwards, and whilst the latter can sometimes tarnish a reputation, it is very rarely the case. What matters is what that player does for that club.
Your definition of 'legend' would exclude thousands of football clubs around the world from being able to declare a player a club legend, which is just ridiculous.