[loeg]

https://lwn.net/Articles/708266/ -- 1,719 in a ~ten week window.

https://svnweb.freebsd.org/base/head/ -- 128 individual developers have committed to FreeBSD head in the last ~ten week window. (svn log http://svn.freebsd.org/base/head |egrep '^r[0-9]{6,6} \| ' | grep -B999999999 2016-11-25 | cut -d" " -f3 commits.log |sort | uniq | wc -l)

So Linux has more like 13x individual developer count in recent times. You can round that down to 10x if you like, but 6x doesn't tell the recent story.

Note that this is comparing the Linux kernel to FreeBSD base, which is like kernel + glibc + coreutils + binutils + other stuff.

[inopinatus]

Mindshare is not a zero-sum game like market share, so scope of function is irrelevant; and is not a short-term phenomenon, so ten weeks is nothing.