My thoughts are basically this:
The Germans lost so many paras, and even more parachute transports, like JU52s in Crete and in Holland (seriously, the Dutch[!] alone destroyed something like 250 out of the 450 combat transports the Germans had available), that they'd have to do something to make up the balance, because Malta wasn't going to be a walkover. Bringing heavy equipment like Panzers into the equation would be a logical countermeasure to take, as one of the major problems with German parachute operations was just how lightly armed their paras were.
However, that would be ruled out by the Maltese terrain.



