Spurs arent Tier 1, they are in Tier 2 of that list. Chelsea faded in the second half of the season and still finished above Spurs by 3 points. Arsenal were favourities for 4th place until they lost it and then Spurs took over. Just no way Spurs can be considered Tier 1 over the others.
Tier 3 & 4 Im not sure how you determine that...ambition, owners, league placing, recent history. For example Brighton finished 6 points and 5 places above us and arguably with a decent striker could've done even better. West Ham are miles above us on 11 points and last season had European football, I bet they dont consider us in the same catergory.
I think you combine Tier 3 & 4 and it depends on a particular season how each do, sometimes a team does well, sometimes they do poorly. The difference is that we have more money, but some of the others have consistency finishing higher than us regularly.