I'm familar with daisy chaining. You usually see an input jack and a through jack on a cab. The GK 112 only has one input, labeled input. It also has a speakon connector, which allows one to bi-amp through the speakon connector or run a full range signal through the same speakon connector. There's a biamp/full range switch on the control panel that allows you to run either biamp or full range from that speakon connector.
There is no mention of daisy chaining in the cab's instruction manual available on GK's website. Without daisy chaining, I can only run two of the cabs at a time, using my amps' two speaker outputs. I was hoping to run four cabs on occasion using the Mesa 400+, which can do a two ohm load, but daisy chaining is necessary to do this. With daisy chaining, I can also run four cabs with my two WWUltras- two cabs per amp, with the effects send of one amp sending a signal to the input of the other amp, and thus keeping a four ohm load on each amp. Again, daisy chaining is key.
I'm particularly interested in this design because the cab's width is 23.5", which means that the Mesa can sit on top of it nicely (it's 20.5" wide sitting in its road case), and the cabs can be stacked four high without the stack getting ridiculously high, and the speakers maintain vertical alignment for optimal lateral dispersion. The cabs will be great when only using two as well. Stacking them with the 23.5" width vertical will yield a 47" vertically aligned 2x12 stack, which will work well, I'd think.