This is simply untrue, and not a claim that even any of those people have had the audacity to make.

The extent of Hearn's involvement in the project was a couple commits in 2013 and 2014. Gavin-- once a fairly active and appreciated contributor-- sunsetted himself years before, primarily to focus on creating the "Bitcoin Foundation" though he later alienated himself completely after the foundation discredited itself and largely imploded with rather abusive public attacks ("should be fired") and by vigorously backing a pretty obvious scammer. But in spite the bad blood there, you don't see support for your conspiracy theories -- because there really just isn't any substance to them.

If you look at active project competition most of the same people who are most active today have been most active pretty much all along:

     /-----------------------------------------------------------------------------
     |             Non-merge commits in Bitcoin project git
     |         2010  2011  2012  2013  2014  2015  2016  2017   All | Active months
     |-----------------------------------------------------------------------------
     |Wladimir    1   349   159   115   384   193   197    93  1491 |            73
     |Pieter      0    51   227   111   170    89   156   112   916 |            75
     |Matt        0   101    71    38    25    54   100   143   532 |            66
     |Gavin      17   152   139   112    47    17     1     2   487 |            61
     |Garzik      0    38   106    35    48     7     0     0   234 |            36
     |Hearn       0     0     1     7     2     1     0     0    11 |             8
     ...