Regardless off the result in this case, I can't see why we'd ever wish to gamble shove/raise with AK in this spot, given minimal invested and a 100BB's behind us. AK is the scourge of many players early in tourneys as it's so often overplayed. The massive raise size by a 'solid pro' seems more suspicious, an attempt to get paid big by calling stations. I'd also be highly concerned by the smooth call of £4k behind. Protect your 100BBs and pick better spots.
You're absolutely right except for the 4k limper, you had to see it to believe it.