This sounds very plausible. Thieves are known to work in gangs, happens a lot (or at least, used to) in De Beauvoir, Hoxton. Sounds like you called it right.
That Quintana Roo was (possibly) nicked ages ago I think. Saw it leant outside a barbers in Atlantic road and mentioned it on here a couple of years ago.
Could well be a bunch of bike thieves. Saw a few operating around there when I lived in Tulse hill, including a 13 year old riding a high spec colnago in his high-tops despite the fact it had lush Keo's on it and was far too huge for him