The Chairman Souness idea is just daft. Not because he's past it or because he's not a Rangers man ... but because he's not an experienced board chairman.
Nor is there any sense in this idea that the chairman needs to have financial pull. He doesn't. That's a mentality that became entrenched under the Murray dictatorship when one man ran the club and personally took all major decisions. That's not the role of a chairman in any normal corporate structure. In many cases the chairman doesn't even have any executive role in the company. His role as chairman is to ensure the board fulfils its legal, fiscal and corporate obligations and to ensure board meetings are conducted Ian effective manner.
There's no benefit as I see it for the chairman to have Rangers connections. Good if he does but someone who has experience running successful companies or financial institutions would be acceptable.
The person who needs to have financial pull is usually the finance director but it can be anyone on the board and is often a non-executive director appointed by the board for that specific reason.
That's not to say there isn't a place for Graeme Souness on the Rangers board. In my mind he would make a good appointment as a non exec director, not because he used to be our manager but because of his media and international football connections.
All of the above depends of course on Rangers having adopted a normalised form of governance and has ditched any residual structures from the Murray years.