Should I embrace being a jack of all trades? Or purely focus on commercial?

At a small commodities shop, lets say my title is "Junior Trader/Optimization Specialist." It's like 12 people total, so pretty unstructured. 

Let's say I am genuinely really good at solving any kind of higher level scheduling and mid office task. I'm not punching things into our ERP system; this stuff is actually pretty hands on and rewarding. This work does make me valuable, but it's also not work that people are fighting over (lol). 

I think I am good, not great, at putting commercial deals together. I'm fine on the details and technical part of it.  I just don't have the network that some others have - 20 year industry professionals, etc. It can be tough to compete against this. But this is also the way more lucrative/interesting piece of the business. 

My question is - when should I act as a helper for other people, vs me demanding to handle something direct? 

A specific example - I originated a counterpart, hardly anything groundbreaking. I did a few marginal deals with them (not even enough $ to even remember). My shop hired a new senior trader, and now he's basically just trying to transact with them, in the same market. He's literally just doing it without any internal coordination.