Okay please clearify this things because i seemed to have made quite a lot of fuss about it due to character knowledge.
Do you guys mind going independent ? While Mark has little negotiation, he'll have to get very creative to make it work the long duration of the mission and the fact that it may fail leave him with very little room for negotiation. I have some initial ideas, since Mark has security drones a high end RCC and other expensive equipment he can perhaps be hired as a security for the establishment. With Scarcraw as a physical muscle, Mark covering astral, physical and matrix and Cinder as a 'police' connection to keep from troubles the three can make a believable offer to protect the project. Perhaps get some money, but we'll need a side gig if Mark wants to survive for the longer term.
He is a reasonable hacker but I am not sure if he qualify as a decker. He has an RCC and while sleaze/ DP actions are covered good I have never tried not having a deck so I do not know how much we can count on successfully completing the main objective and getting paid. I'll have to browse the matrix rules and see what he is missing from having a very low attack attribute.