Kasper Schmeichel and Viljami Sinisalo arriving at Celtic have brought the subject of mentorship into the public domain over the last few days. It is public knowledge that the Denmark international has come in to be number one in the short-term, with number two Sinisalo learning by his side ahead of potentially being the long-term solution between the sticks at Parkhead. This makes great business sense, especially when you consider that Celtic have recruited two competent goalkeepers for the combined price of £1 million. Nevertheless, looking at prominent figures as an example to the group sho…