i dont think Bheeshma follows the usual plot where the protagonist takes on the antagonist. And again the question remains who is the antagonist. Its not really Rajan. Because he is being used by Anjootti family, mainly James for their own selfish objectives. The first half of the movie is all about the growing resentment within the Anjootti Family. So the protoganist is part of the Anjotti family . If you look at the overall movie, references like Michal ettayi arinjal pinne pranthan kuriachan vicharichalum rekshikkan kayiyilla" all refers to what sort of person Micheal is . Even his brother gives an idea of Micheal. So Rajan is definitely not someone of an equal standing . Towards the end you might see like the movie is rushed. But its just Michael deciding to end the matter once and for all. He knows about Father Simon, he has heard about Ali's murder and now he comes to know involvement of Martin in Paily Chettayi's murder and with him being attacked, there is no need to take his own time. And he feels its time to let the balances be restored. And he knows what Ajas is capable of . But he did not want Ajas to take the sword. Thats why even in the initial fight , he says dont call Ajas . But once he realizes that its time, he lets Ajas complete the work
Coming to the songs , you remove them , it just becomes another gangster drama . You need family elements for a movie to be successful in the box office. Or it should be something very different like CBI where you dont need a song to affect the flow. And both songs have their relevance. Rathipushpam gives an idea of what sort of person Peter is . The way he works with his production crew and all shows his frustrations . And to a certain level, it gives a clue about his sexuality. I dont think Michael was some one who didnt like him for that . Because you see Michael supporting inter faith marriages and stands up for right. He is not the typical conservative person of the 80s. And the song AakashamPole suddenly gives a new dynamic for the film. Till then the audience has no knowledge of the romantic angle between Ami and Rachel . And that is one reason why all of a sudden you have martin joining the conflict directly and ends up killing Ami. I think Amal did a great job of telling all of that in a single song. The intimate scenes gives an idea of intimacy between both. And thats when you have Rachel telling Michael , that she wants it settled , the audience can feel the pain.
And as few have already noted , yes the movie itself could have been explored from different angles. Even you can have sequels, prequels for this movie. Even sushin did mention that Amal when he gave an overview he was telling the whole Micheal story which was not even in the movie. Now coming to Bilal, BigB didnot have very tough action scenes. Mammootty had 2 action scenes in the movie, Seagull bar and then towards the end. All you need is a good choreographed action scenes with good camera work . Hopefully it happens soon