Just looked it up and you are right. The relevant statute is Section 5 Number 2 "Lizenzordnung Spieler" under which a player may only be loaned out to another club if the contractual relationship between the player and club extends beyond the loan period...
Nope, if you take all those wrong decisions into acount, the lead of Bayern would have been even greater: http://www.wahretabelle.de/index/index/liga/1?saisonId=205
Got to love Draxler's athleticism. So smooth on the eye and Loew was well adviced to start him over Goetze. Kimmich also doing a tremendous job with his crosses.
The way some Argies are acting after the match proves already why Germany is the much more deserving winner. No sportsmanship at all. Remember small final 2006.