He has no Magic wand to produce a spinner from no where in 6 months... Shohag was doing well in domestic even before Saqlayen met him. He has definitely started learning from the coach, but I'm sure he isn't yet a Warne/Murali, but he has the potential, if Saqlayen helps he surely can.
So, Lets not go overboard in praising Saqlayen yet....lets see how crafty the spinners get under him and you only get to know a spinner's skills in non-turning tracks...outside Bangladesh...and better teams. BD pitches anyway favor's spinners and WI isn't that good handling spinners.... So lets have some patience...