I have to agree with Jimthebrewer here. We have both worked with breweries, flavour matching/profiling is a very important and also challenging for successful, competent brewers.
Along with inevitable variation already mentioned by Jimthebrewer, supply chain is also another factor to supermarket beer, what temp has beer been kept at along it's journey?
These flavoursome 'craft' beers are understandably not as stable as artificially mass produced, stabilised, filtered, pasteurised and light stable beer.
Beavertown have very much autonomy and strive for consistency, constantly.
As to Heineken involvement? Think about it, there are now over 2000 breweries in the UK, the ones growing quickest are the beers that are being emulated here, surely that is the sincerest form of flattery. These breweries cannot just crowd fund a couple of million, to expand a brewery, these are well past that now. Where do they go for finance to expand or indeed get better access to supply chain?