i think i might have said it in the breaking bad thread a long ass time ago, but i think gus is pretty smart, and he probably kept the recording of when walt barged into the chicken restaurant and asked for gus, and was acting all crazy and ran into the back of the store and shit. i think hank's going to find it on gus's laptop and its going to ignite something in his brain, its going to click that walt might be heisenberg, and he wont let the DEA know or anything but he'll keep the idea there and keep working at it, maybe even following walt around, and walt will be too cocky to think that anybody could catch him so he'll be slipping a little bit. maybe it'll go on throughout the season, hank thinking walt might be the guy, then he'll catch him at the end, and confront him, but since hank will be doing it on the down-low walt will think he can just kill hank or something and end the investigation, and maybe try to kill hank, but hank will take walt out and bam, show over lol