I tried different root checkers. some said i have root some said i did not. So i tried actual app "kernel auditor" which needed root access and it did not start.
Now i installed supersu app it asked for update. I mounted /system 'rw' mode, it updated su binary was ~95 KB now ~157 KB.

Then uninstalled superuser app because it does not give prompt and blocks requests. I see it in log.

I copied this su (~157 KB) binary in. Notice these 2 are the same file just renamed.

/usr/bin/aliendalvik-superuser-binary
/bin/su

and shortcuts
/opt/alien/system/bin/su -> /usr/bin/aliendalvik-superuser-binary
/opt/alien/system/xbin/su -> /usr/bin/aliendalvik-superuser-binary
/system/bin/su -> /usr/bin/aliendalvik-superuser-binary
/system/xbin/su -> /usr/bin/aliendalvik-superuser-binary

and kernel auditor starts! Some root checker still says NOT ROOTED, but actual app that needs root does start