True, those 13M ICN could be transferred to different address earlier. The thing is that it's not a 5 min effort. This has to be configured (smart contract, multi-sig and stuff like that, you know), tested, and retested. Or in other words - shifting focus from core development into this.
Priority was releasing the platform for beta testers, which will lead to earlier public release (so you can finally buy ICNX and perhaps be a little bit less bitter).
Call me crazy, but I have the feeling that if they would do that you or someone else would complain about loosing focus on the main goal.
13M ICN will removed from ICO address, I still can't see how this is less transparent doing it before the vesting starts.
What gives it the most weight is that it was stated it would happen, by a representative of the team. If you hadn't asked, and Jaka never gave you that answer, I doubt I would have came up with the idea myself.
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So your concern is with the way it was communicated, and not with them actually secretly trading?
Otherwise it would make no sense to even state something. If they wanted to do that, why not just saying that the addresses will be created short time before the vesting starts? Much easier to trade them locked ICN, no?