I have been dealing with this shit and it is high time I put my foot down. If I had it my way,I would have had them both fired. Sure,we'll be a bit shorthanded but haven't we been this way all this while? What difference would it make anyways?
Firstly,I would propose the idea of getting of the both of them. Then,I would recommend solutions.This would mean,I would either need to suggest new members or find ways to dealing with the short-handedness.
When I say too many variables makes things complicated,this is what I meant.I'm not saying quantity is not a good thing.If the quantity can ensure productivity and progress,it is most definitely a good thing.Seriously,in the reality of it all this is highly unlikely.
I personally do NOT recommend hiring students because they are unreliable.ENTIRELY.
I am currently dealing with 4 students right now and I seriously do NOT want them in the team.
I suggest that we get rid of them once and for all and hire people who may not have skills YET but at the very least shows up for work.
It's all about the attitude.