not sure how to wire a troffer
You need a disconnect by law, unless the troffer is cord-and-plug connected.  You can twist the wires out of the old disconnect, but then you'll need to go buy another one -- and they sell them in packs of 5 at most home improvement stores for about $5.  

What matters is the wires on the ballast side

I gather the disconnects have some pigtails of wire remaining on them, and you're tying onto those? Okay. 

Who really cares what kind of spaghetti they have on the mains side of the disconnect?  Those wires are cut off and not part of your circuit.  What matters is the wires on the on the ballast side -- one will be black and one will be white.  And you need to connect to whatever mains-side wires will make your hot wire talk to the ballast's hot wire, and your neutral wire talk to the ballast's neutral wire.  

This is obvious on an Ideal style disconnect. If you have a Wago style disconnect where it allows 4 line wires, then you need to look closely at the disconnect to see how the wires relate to each other.  Typically the disconnect is plainly marked with 1 ballast side wire marked black, and 2 lineside wires marked black.  You just have to look for it; it's there. 

If you don't trust it, yank the wires out, throw away the disconnect and go buy some Ideal style - they are less confusing to the novice, though they may require pigtailing.  I prefer pigtails for novices; they are more clear. 

Never reuse disconnects. Their "stab connectors" are only good for one use, after which the spring is sprung and it won't make good connection again.