How's this for a revision?
Companion [-1]
Description: You and another being are inextricably tied. Whether it be a blood brother, a familiar, or something else, the two of you are utterly devoted to one another and your fates are intertwined.
Musts: You must define an NPC character or creature to be your companion. Take an aspect that reflects your tie with it.
Effects:
Ally. Create a character sheet for your companion. It has 2 refresh to spend and 3 skills at Average (+1). It must have a high concept, which decides what kind of powers (if any) it has access to.
Training. You may spend skill points to improve your ally's skills. You must follow the skill pyramid rules as normal, and your companion's skills are capped one level below your own (so if your skills are capped at Great, your ally may not possess a skill better than Good).
We are as one. You are subject to compels on the aspect that defines your relationship to your companion and, in some cases, to any aspects that your companion itself has. You may choose to spend your own fate points on rolls and declarations made by your companion. Your companion may not possess fate points from compels, because of unspent refresh during milestones, or for any other reason.
Level Up [-1]. Your companion gains an additional two refresh to spend on powers and stunts. If you have more than one companion, you may split this refresh among them in any way you desire. The total refresh spent by your companions may not exceed half of your available refresh, including refresh spent on powers, stunts, and Companion powers.
The More the Merrier [-1]. You gain another companion. It starts with 2 refresh to spend and 3 skills at Average, just like your original companion, and may be improved via Level Up. The total refresh spent by your companions may not exceed half of your available refresh, including refresh spent on powers, stunts, and Companion powers.