Impedance of Passive Sub.

I recently took apart a Celestion CS135. After reading a review I was expecting a decent crossover but I was misinformed.

How does the lack of a proper crossover affect overall impedance?
 

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Can we assume from this that the satellites are high passed with one capacitor and the sub is run full range?

It's worth noting that the bandpass design will tend to do the crossing. Placement always helps. Your satellites could have their resonance modified, perhaps a peak in that region.
 
It is going to be difficult to guess this, you might want to imagine it, or sim or measure. I expect it will work adequately just as it is.

A bandpass plot will look similar to reflex. The satellites impedance will rise below the cross. It looks like 300uF so it would start cutting 8 ohms at 65Hz, though the resonance peak may hold that until a different point.