There was a moment at Rangers when the club looked to have the opportunity to build after finally taking their place back on the domestic throne in Scotland. But the mismanagement of the Rangers squad, transfer budget and that brief grip on the domestic game has seen a chronic downturn which forced a monumental change of tact in the summer transfer window. How things are going to go under Philippe Clement’s youthful revolution remain to be seen, but there are a number of players Rangers fans reckon slipped through their fingers over the last few seasons. One of those is Sporting Lisbon striker…