Bill says that DBC had a device where he could pinpoint his location while aboard 305 and zero in on Merwin Dam. Boat #1 was an Alumacraft parked below Merwin Dam. Boat #2 was a Zodiac that DBC took from T-Bar prior to the skyjacking and used it to commute to PDX.
Hence, DBC jumps near Merwin Dam, walks to his Alumacraft, motors down to the Columbia and turns upstream to T-Bar, where dry clothes and a hot cup o' coffee awaits him in his pick-up truck and camper. DBC then loads the Alumacraft onto the camper's boat trailer and hides the loot in a secret compartment underneath the camper, where he loses about 6,500 bucks worth of ransom in the process, found later by You-Know-Who.
DBC then motors off in his p-u/camper/boat trailer to the River Road neighborhood of PDX and retrieves his Zodiac. Afterwards, he drives off into obscurity, only to be identified in 2017 by Bill Rollins.
I like Bill, and I admire his tenacity and dogged research. But I don't think Lakich is DBC.
What I am most intrigued by Bill and his theories is his strong emotional connection to Cooper. As I understand Bill, he keenly feels Cooper's grief that underlies the "grudge." Bill feels as intense, persistent bond with Cooper.
Similarly, Derek Godsey feels intensely about Klansnic. Derek says he started weeping when he read about Klansnic in Hydraulics Illustrated magazine. This "psychic" bond or "intra-psyche" connection is new to the Vortex, and I find it very interesting.