I actually have some similar ideas regarding redesigning tiers to more accurately reflect skill levels... Even a simple 1.5 might be adequate.
Edit - without actually discussing who would move to a specific tier at the moment, why not discuss again what tier distinctions might be appropriate. Feedback welcomed/desired.
Any tier will need to have a very clear, very specific definition. I wonder if we should have some sort of separate category for the players that typically only play as 1 character, but do so exceedingly well. When I see players like this, I generally think in the negative - my team selection is limited. As such, that would generally drop players that have the talent for the highest tier (but create a certain amount of inflexibility in a team) to a lower tier. Any ideas on how to compensate for this?
So, the intial, basic proposal would be to create one additional tier fitting between tier 1 and tier 2 called 1.5. Logically, we should just add another rounded tier into the mix (eg t1,t2,t3,t4), but I think the 1.5 would help initially with people feeling slighted. Its easier to accept moving from tier 1 to 1.5 and feels nice surely to go from tier 2 to tier 1.5 (instead of dropping all of the tier 2's to tier 3, then elevating some of them, etc).
Also - I don't want to get too over the top, but some players are tacticians, some require a support characters to play there best, some have awesome map awareness, etc. I personally see tacticians as having a higher value, but perhaps I should leave thoughts like that out of the tier list. For me, the truly highest level players in this game are tacticians able to play all/just about all characters extremely well. These are the guys that have great map awareness and port in when appropriate and call off ports when there is no point in coming. They flash ports quickly/frequently to back away opponents from flags/towers. They buy cit upgrades and kit upgrades as appropriate. Possess good strategies for XvX for early/mid/late game. They are adaptive enough to adjust their style of play if it isn't working based on the team they are on. They pick appropriate dgs to compliment their team. They plan traps in game to goad players to follow. They... use sigils. They aren't feeding the other team. They understand the math and reasoning behind getting cit upgrades at certain points.