Yes, we needed a committed team for the long term. Developers are human and such, one developer might choose to leave or is unable to continue for any personal reason. Working with one or two developers, will leave us subject to a scenario where the dev team is crippled. I can not count the times this has happened or projects that suffered from a developer unable to continue. All our devs are capable of working on their own, however, as the saying goes, do not put all your eggs in one basket.