Lucius at Hogwarts and Rita Skeeter/Plot holes

[Florence]

No: HPFGUIDX 18431

It is implied that Lucuis went to Hogwarts when Draco is talking to 
the Polyjuiced Ron and Harry about the Chamber of secrets.  He says 
something like "Father knows stuff about the last time the chamber was 
opened, although it was before his time"

Rita and Plot holes
Someone mentioned JKR built up Rita to fill the infamous plot hole and 
act as the conduit for info from the school. I thought from this that 
probably Rita wasn't originally going to be an unregistered animagus. 
 (Who else had that Oh no! not another unregistered animagus feeling 
when that was revealed?)  Anyone else think that seems plausible?

Anyway if that is the case it gives me a little more hope that Rita 
might indeed keep her word to Hermione on no more reporting for a 
year, and actually keep her nose out of things for a while.

Florence