Lupin on the Hogwarts Express

[meriaugust]

No: HPFGUIDX 99490

Has anyone figured out why Prof. Lupin rode the train to Hogwarts 
for the start of term in PoA? No other DADA professors (Lockhart, 
Moody, Umbridge) in particular (and in fact no other teachers) have 
ever been on the train so why was Lupin? I was thinking that Lupin 
might have been a last minute appointee to the post of DADA teacher, 
and so the train was the only way for him to get to Hogwarts. But 
why was he a last minute appointee? Was it because he had a 
relationship with Sirius Black, who has just escaped from Azkaban 
and DD (fearing, I don't know, something) wanted Lupin close at 
hand? It's too big of a coincidence that Lupin should have been 
appointed to the DADA post *before* Black escaped. After all, DD 
appointed ex-Auror Moody to the post when he knew that LV was on the 
rise again, so maybe there was reasoning behind Lupin's appointment, 
too. Any thoughts? Or am I cracked? 
Meri - who really really really really cannot wait for the PoA movie 
next week!!!!!!!!!