It seems that other Sours fan sights are discussing Vertonghen's recent performances like we are here.
On one of the threads i read (i think it was Tottenham Hotspur forum) somebody posted a link to this web article:
http://www.spursfanatic.com/blog/jan-vertonghen-impetuous/
The article raises some interesting points,including a conclusion that Verts is becoming like Vermaelen in that he is diving in and trying to stop danger at source and further up the pitch and leaving the defence exposed if he misses, a la Arsenal. The article also notices that a lot of Belgium's CBs are playing like this at present,like it's how they are being/have been trained: Vermaelen as usual but also now Verts, Alderweireld and Kompany.
Interesting..