The location of the bike is being discussed and there are references to it being found in a "bamboo forest". I lived for quite a few years probably 6 blocks south of the general area where MW's murder took place. Many of us had groves of invasive running bamboo along our back fences. It's incredibly hard to eradicate and the growth pattern is quite dense at times. So think of bamboo "grove" rather than "forest" or "brush".
Is there any reference to how far away MW's bike was found from Cash's upstairs apartment? A bike that expensive ($10,000 to $13,000) would be very light, I'd guess between 16 to 18 pounds. It crossed my mind that KA, very fit, in a rage and hugely pumped up on adrenaline, could have picked up the bike and flung it into the bamboo from the upstairs porch. The could explain why there were no bike tracks through the grass.
The bike had to have been upstairs, inside the apartment. No sane person in Austin leaves a valuable bike outside unattended, even if locked.