HT, the "route K, J, E and M" seems nice, but it's only one route.
What if you have two ways taxiiing traffic to manage?
Absolutely, and most likely the reason. Nevertheless it does beg the question about a procedure which requires a heavy jet to cross an active no less than THREE times at a busy international airport when there are other options, even if it does mean holding inbound traffic to the most southerly gates of T1.
Might be an idea to extend J to M for starters.