You are partially correct as this matter is difficult to understand for many.
When TSN debuted 5 channels, they made the error to people with digital receivers as if you were in say Saskatchewan you would only get TSN3 because they were part of the Winnipeg Jets region but weren’t able to get the other programming and other feeds unless you subscribed to a national provider which was rare at the time, or paid for another package. So TSN switched to a national network distribution policy for all of their channels for service providers as they are on the basic package coast to coast. They got that approval from CRTC in 2015 and it came into affect early 2016.
TSN1 is used as their primary feed for content and flagship programming. So the CFL will always be shown on TSN1. Why? So everyone could get the event, including satellite (non subscribed) and distributing (subscribed) satellite companies such as shaw direct. CRTC gave them regional rights in their deal when they made the switch to 5 channels which prevented them to distribute nationally their original content at the same time. So CRTC reversed their decision and allowed TSN to anchor its content on (4) channels only on regional events and then distribute its channels on (2) channels under the same umbrella, Which is TSN1(main channel) and 2 (alternative). This is why many people do not have Sportsnet West if you live in Ontario unless you get your providers sports package as of 2016. And you still do not get their regional rights and that is why Rogers is furious because most of Canada does not get any of the SportsNet packages (which also hurts Hockey Night In Canada #'s) I know so many people who do not have SportsNet and if it wasn’t for the CBC, they wouldn’t be able to watch Hockey Night in Canada.
Confusing the matter was when people would say ‘‘TSN4 is on my main television guide and so that is why TSN4 is my main network’’ That is what it looked like but is inaccurate. This started in Manitoba, parts of Saskatchewan, and Kenora (as they used a legislation territorial rights ruling due to Kenora, Ontario was once part of Manitoba. The Maple Leafs fought this and lost cause they lose the entire region) when the Winnipeg Jets returned. The Winnipeg Jets broadcast deal was the first in the nation which gave the TSN the vision and authority (CRTC) to broker their deal for 3 more TSN channels. TSN and the Winnipeg Jets had their own channel separate from TSN1, and TSN2 called TSN Jets. It was an extra channel for subscription only.
Prior to 2016, the CRTC and providers kept their lineups the same so TSN3 would be channel 13 and then move the HD channels as a bundle package to acquire subs. This all changed of course due to TSN acquiring other feeds.
So TSN4 for example would show local Toronto Sports the first year as it was confusing locals, as TSN4 appeared on their guide.
TSN4 and 5 are used for lessor sports such as tennis, soccer, and any sport that they do not want to interfere primary content, except for when TSN shows regional content(NHL) But by the time NHL season starts, usually all feeds are showing the same major events and does not matter such as Thats Hockey, SportsCentre, CFLwired, NFLlive,etc
Also all of the TSN produced original content will be shown on TSN4 or TSN5 in evenings.