As for ObjC, yes, I place it as both dynamic and static, thanks to the “id” data type, which is roughly a flexible “void *” pointer, with which you can reference any kind of object. The runtime method dispatching method takes care of the rest, which means that you can type your code as if it were a dynamic language, bypassing almost completely any compiler checks. Cool huh? It’s the only language I know with such characteristics, I would like to know if there are any other like this?

You put Objective-C in static *and* dynamic ?

Your last sentence make sense:
“get your team working proactively, collaboratively and teaching each other, the choice of a programming language comes in second place.”
You can even drop any programming language considerations that frankly doesn’t matter, because the first mistake I see is to now work in collaboration and teach each other (as you say). The CIO (sometimes also known as the PHB) should focus on hiring imho. Is that viable to start a project using the language XYZ if you have the only two developers that knows it and hiring more or replacing them will be very hard ? It is if you don’t work in silos and make sure new hires can jump into it.

Companies need people that communicate with each other, all the good things will follow ;-)