Slices, the HV also reassured me that plenty of children are not fully potty trained by age 3---but I swear the mothers of those particular children are hiding, or incredibly quiet. It seems like everyone I know has children that trained insanely early compared to my own.
My little guy has always been behind the usual timeline for developmental milestones and I suppose he'll sort out the potty training in his own time, as well. He was a late sitter-upper, crawler, walker, etc, but he mastered all of them beautifully...eventually. I knew there was a reason I threw away all of those benchmark books long ago. The timelines drove me buggery crazy!
In any case, thanks again everyone!