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Blue/Purple Winrates

Recently it seems like purple side has a pretty big advantage.
If two roughly equally strong teams play each other purpe side will almost always win. Is that reflected in the win rate?
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I think this issue was addressed in the TS1, however the developers will have statistics to see if there is any unbalance.

It may be a matter of perspective, you may be giving away 2 strong picks when you sandbox other teams, try re-adjusting your strategy.
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In my opinion its mostly because even if you get 1 of the top picks the other team gets 2 instantly. Its hard to react to that :D