Do we need 5 in middle V San Marino
No.
we need players who have a bit of creativity to break down what you would expect will be a backs-to-the-wall set up by the marinonians (or what ever their plural is).
5 in the middle would be lunacy. horses for courses. i'm all for continunity but you need to be able to alter tactics according to the game.
IMO the reason we struggled to beat so called inferior opposition under charlton espically was our inability to alter our formation and tactics. the long ball/put em under pressure tactics used against ball playing sides worked but against lowly opponents it played into their hands