A word of warning to John Lundstram, Borna Barisic or any of the other players who may be saying their goodbyes to Rangers over the coming months. The grass, as they say, is not always greener elsewhere. In some cases, it is not even grass at all. Instead a decaying field of dried out stalks and yellowing weeds. You certainly don’t want to end up like Ryan Kent, the forgotten man of Fenerbahce who has played only five minutes of Super Lig football since mid-November. Or Alfredo Morelos, seemingly booed by his own supporters despite scoring a rare goal in a miserable spell at Santos earlier thi…