I am a recently hired postdoc. I was tasked to prepare two documents for my first project. The project was for a company where we needed to provide results when it's over. I was working well on my own and I had many meetings with my PI and was always giving me suggestions. In one meeting, the PI told me that he will bring in a senior postdoc to review and edit the documents. He told me that I can work with him on this and ask him to prepare sections for the documents. He said he is bringing him over not because I was doing a bad job but the other postdoc has more experience than me in one stuff and he could help.
I have no issue with teamwork, I also understood what PI was playing it safe and probably wanted to avoid this scenario: I will be work on the documents for the entire period and when the deadlines are over, he will find out that I did a bad job and there isn't too much catch up.
The issue is that when I met the senior postdoc and explained the project and send him documents, I told him that I need help with section X and Z. He said he will try because he is working on other projects as well. For the first document, he only left comments to re arrange some sections and told me that the first document is good and already had all the content. I was happy because I needed an external validity and I was nervous because this was my first project. I also gave him the benefit of the doubt because the first document wat 97% over. However, he wrote in the document that he prepared the document with me. As far as I can see, he only reviewed the document and left me some comments, he said he can't write sections because he is busy and I have a long email from the PI saying that he should edit the documents as appropriate.
I didn't want to raise the issue because it was simply my first encounter with everyone. I don't want to create a bad impression when it comes to teamwork. For the second document, I wasn't making a lot of progress and I had so many things to do as well. I emailed him that I need help with some sections I can't work on the document this week because I have a presentation. 10 Days later and the document is still the same. I know he is planning to leave me comments on the side that will make me do more work and actually "help me". I don't know how to react to this whole situation. Should I talk to my colleague directly? or should I tell the PI first? Or I should just let it go.