Shariputra and a bodhisattva losing bodhicitta
I can only answer the part of your question relating to the Lotus Sutra. I hope a partial answer is better than none.

From my recollection of reading the Lotus Sutra - Shariputra is portrayed as someone who hasn't made the journey all the way to enlightenment yet. He believed he had however the Buddha clarified this and states that he is stuck on the lower teachings. Unlike some other Mahayana sutras he is portrayed in a positive light and it is predicted that he will attain full enlightenment and become a Buddha named Flower Glow.

Though it isn't translated as bodhicitta in my copy I think this might be the quote you are looking for 


  Shariputra in the past I taught you to aspire and vow to achieve the
  Buddha way. But now you have forgotten all that and instead suppose
  that you have already attained extinction.


[Quote from pp 51 of the Burton Watson translation]

I read 


  vow to achieve the Buddha way


as the bodhicitta - which I have previous heard translated as the 'will to enlightenment' which I propose is the same thing.