Well plagiarism is a reason for permaban, and I think that i provided enough proof and showed that this is an obvious case of that, so he should be banned.
You need to prove that EMEKA OKOLI stole the video/content from someone else for this to be considered plagiarism , and for this to work you need yakin102 to actually complain and say " EMEKA OKOLI stole my work" which is not going to happen because apparently EMEKA OKOLI is yakin102 , and yakin102 is EMEKA OKOLI
.
You might argue that yakin102 doesn't have to do that , because EMEKA OKOLI could have used the work of Steven Spielberg and Steven Spielberg wouldn't come here to complain , that makes sense, but the moment EMEKA OKOLI posts here using his "friend" account yakin102 and says that was his own work, this case is closed as far as plagiarism/ban is concerned.
as for tagging the user for having an alt or using the same video twice, it's hard to judge , I don't tag alts unless they try to scam , if this user have not participated in
the same contest using two different accounts , I don't think a negative is deserved, but hey that is just me, I am sure many others will have a different opinion.
Sorry to let you down, you did a great job out there, I have no doubt that EMEKA OKOLI is yakin102 and he is the typical shitposter , bounty/contest hunter which the forum would do much better without, but really, you can't make this a perfect place, this isn't a perfect world after all.
edit:
I forgot to comment about this post >
https://bitcointalksearch.org/topic/m.53325981 it's quite interesting, assuming those are plagiarized / stolen , I think you should report them to Youtube so that they ban his account or delete those videos or whatever they do for these kind of cases , ,I don't think "mistakes" made outside the forum are judged by the mods here, but you can try to take this case to meta and see what the mods have to say.