ok - this isn't a good question. I wrote DBCC CHECKDB and I got the answer wrong. I guess it could be down to BOL stating that disabled indexes aren't checked - yes they are to an extent, as long as the pages in them are still allocated then they will be checked - and have to be. The nonclustered index cross-checks aren't done for them, but allocation checks etc are checked.

Nice twist with the stats on the last answer - CHECKDB has never checked the stats blob.