The game theory implications of this are kind of entertaining.
For example – if you're in a R voter in a deep blue state like California or Hawaii, where previously there was no point in voting because the D was certain to win the state's electoral college vote – now there's a reason to vote in your state's presidential election because you might be able to sway the Colorado electoral college vote!
Even if IDs could be manipulated (and I'm not suggesting that they can or can't) – there is strong evidence that is not the case here and Q did make the non-tripcoded posts.
Explanation:
In the first bread, Q posted with tripcode, then there were 2 with same ID without tripcode. Suppose those second 2 posts were not Q.
In the following bread, there was a "test" and "test2" from an ID, then a third post "test3" from the same ID and with the Q tripcode.
For the 2nd bread, Q did not challenge the authenticity of "test" and "test2" - and implicitly confirmed with "test3" (building in sequence). It would not have made sense to say "test3" unless "test" and "test2" were associated.
If "test" and "test2" are from Q, we have evidence Q posts sometimes without tripcodes. And since Q did not challenge the 2 non-tripcoded posts from prior bread, implicitly those were verified as well. (That is, immediately after the 1st bread where it appeared Q posted wtihout tripcodes, Q provided evidence that Q sometimes posts without tripcodes.)
So going forward, we have evidence Q does this sometimes. Tripcoded posts are more definitively Q, but same ID in a bread is strong evidence.