I think its true Alexander would have given him hell in his prime. A good lefty counterpuncher, speed, movement...everything is there that you'd want in a fighter to combat a prime Hatton. Hatton would grind it out and make it a close fight though.
This fight wouldnt even be close. Alexander would finish Hatton off within 6 rounds, in my opinion. Ricky cannot take a decent punch anymore and would be walkng on to them far too often in this fight. Alexander would be far too quick and powerful for him. It would be a close fight if Ricky was in his prime though.