Some of those that you listed are only available in bulk form. Most of the McClelland Bulk blends are not available in tin form.
This arguement comes up from time to time with both sides claiming that theirs tastes better. For example, I have a buddy who loves Samuel Gawith's Full Virginia Flake (FVF). But he only likes the tinned version. Even though the bulk version is a lot cheaper he will only buy it in tins. He claims that the tinned version tastes fresher to him. I never could tell the difference in the blends that I smoke that come in both bulk and tinned versions. There are some arguements that the bulk form allows more oxygen around the tobacco thus changing the taste a bit. Heck, I've had tinned versions that tasted a little different from one tin to another. I think that this is another one of those preference things. My motto is to try everything and then figure out what you like.
As far as the CAO/Dan blends. I agree with you!! I love Treasures of Ireland - Galway and Treasures of Ireland - Limerick. The only snag is that CAO stopped making pipe tobacco this year in order to focus more on their cigars. They were also the US distributer of the Dan tobaccos and they no longer do that as well. Not sure which blends were CAO and which ones were Dan blends but we may see a few of these disappear because of that. Also, until Dan Tobacco gets another US distributer (which may have already happened) there might be a bit of a shortage on some of these blends.