It seems like Mr. Lazrak has decided to establish his own political party and to keep his seat in parliament. He was expelled from the far-left Socialist Party last Monday after he directed harsh criticism to Mr. Marijnissen, the party's leader, and after a disagreement on the donation of his salary to the party.
Of course, he has the right to do so. Formally he was elected on a personal title, and he has the constitutional right to stay in parliament. It healthy for intra-party politics if all the members of a political faction are sure of their seat, and don't run the risk of loosing their position if they disagree with the majority.
However, it is unfortunate that Lazrak decided to stay. I don't think his one-man faction will have a lot of added value to the Dutch parliament. He himself acknowledged that the disagreements between him and the party are not based on policy; in fact he said that he would almost always vote with the Socialist Party. Also, it is virtually certain that he won't be elected if there would be elections now, nor in a few years.
I would say: do the decent thing and give the seat back to the party.