One of the developers in our development team works part time. He is a good developer and a great team player, but he does not attend the daily scrum meeting 2 times a week owing to time related issues. This is OK at the moment and everything is working out fine with the sprint. However, since a few days, I have been observing lapses in communication and a lack of transparency in the way the team works now. I would like to have full timers on the team, but it can't be a reality right now. How should I deal with this situation?