Andrew is busy with a new project nowadays and he doesn't want that project to become as company like as Jagex is nowadays.
This picture shows +- how much I liked RuneScape:
The more Gower the more I like it.
Fen Research's apparent employment of only three people probably reflects its recent creation, so it seems unlikely that the company will continue to remain as small as it is currently. While it will probably expand, Andrew Gower's wish to avoid "big company politics," his aim of "taking the best ideas from everyone rather than dictating from the top," and the promise of working "as part of a small elite development team," show a definite wish to remain relatively small. With the associated benefits of a more flexible working environment and direct communication to leaders, this could be a significant departure from Jagex.
I have about the same opinion as Andrew Gower has.