Yes, since your name is not on the grant, and you also won't be doing any of the experiments, it's very likely that you will get zero credit. What's at stake here is not just your name on a couple of papers. If this project takes off and something comes out of it in terms of patents/intellectual property, your name will not be on it. This has huge legal/economic implications for you. If you don't know the story around the 2011 nobel prize on innate immunity, I highly recommend you read these:http://news.sciencemag.org/scienceinsid ... gists.htmlhttp://www.behinddiscoveries.com/
We have no way of knowing who is right in this case, but we all know how academia works. Someone comes up with all the ideas and does all the experiments, and the PI takes all the credit. To be fair, there are professors that go out of their way to give credit where it's due, but those are rare exceptions. Most take credit, not give. Sounds like your former PI is one of the takes, not givers.