I believe the one you mention that blends all straight whiskies from Kittling Ridge is Forty Creek. I just tried a mini of Forty Ridge Barrel Select. Being much more used to bourbon, my first impressions were that it was light, subtle and uninspired. I could only discern one stand-out flavor-- sherry. I wondered if they did some aging in used sherry casks, which it sounds like they do from their website:
Forty Creek Website.
The site description makes it seem more interesting than it was to taste. They use typical bourbon grains (corn, rye, barley), but as Chuck said, distill and age them separately. Apparently, they use different ages and different chars of barrels for each grain. You can't get a straight answer from them on age other than the minimum for Canadian whisky is 3 years and they quote that, "Some of these whiskies will be in the barrel for ten years." Again, like most Canadians, it's probably a blend of many different ages, and probably between 3 and 10 years. They claim to use only pot stills in the distilling.
The process seems solid to me. However, I wasn't wow-ed by the product. I guess a sherry-tasting outcome should not be too unexpected from a first-generation distiller who had spent 30 years as a winemaker.