Ok , I will focus on Ocalan here not his peace plan , because I do not think there is one

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Ocalan like or not is a Kurdish leader who has millions who follows him directly and indirectly . He is credited with the kurdish awakening in Northern kurdistan and credited also with establishing the first organized guerrilla movment in Northern Kurdistan after years of turkification which is not something easy .
considering he is the only kurdish leader in the north , his release will be a huge moral victory for kurds and will indirectly means the end of armed struggle and beginning of serious negotiating for kurdish rights within the state .
While many kurds criticize ocalan openly including me , they also support him for what he stood for and what he symbolizes .
Ocalan is a politician and his tactics are very similar to Mam Celal's ones . if you read Mam celal's history and how many time he switched sides and said things he later claimed he did not say or mean you will be shocked .Yet Saddam gave amnesty to all Kurds except Mam Jelal .
Personally I would say that 90% (not including turkified or arabized ) of kurds support Ocalan and PKK , but keeping them in line with our goals through criticism is essential , because neither PKK or Ocalan means Kurdistan and that where the problems are happening . Apo currently is given a status above Kurdistan and Kurdish flag is being set aside in the North which bother lots of Kurds .
So is Ocalan Important ?
He certainly is , otherwise turkey will not go that far to get him arrested and sentence him to life in prison . Keep in mind he could have had the life of comfort if he was willing to give up his principles .