'xsos -p' not reporting top mem-using processes correctly

[JohnTheCrow]

xsos seems to be overlooking PID 1 in this case:
ps_auxwww.txt

$ xsos -p .
...
  Top MEM-using processes: 
    USER      PID    %CPU  %MEM  VSZ-MiB  RSS-MiB  TTY    STAT  START  TIME     COMMAND  
    sasinst   19758  1.6   1.1   2681     378      ?      Sl    Jun12  435:26   /sas/grid/software/SASPrivateJavaRuntimeEnvironment/9.4/jre/bin/java -Djava.security.auth.login.confi
    root      14317  2.6   1.1   1698     367      ?      Sl    Jun29  31:49    /opt/McAfee/ens/tp/bin/mfetpd 
    root      21382  0.0   1.1   1423     362      ?      Sl    Jun23  1:31     /opt/McAfee/ens/tp/bin/mfetpd 
    root      14262  0.0   1.1   1431     361      ?      Sl    Jun29  0:00     /opt/McAfee/ens/tp/bin/mfetpd 
    root      2980   1.5   0.5   283      187      ?      SLsl  Jun12  396:27   corosync 
    root      1254   0.1   0.5   274      168      ?      Ss    Jun12  35:15    /usr/lib/systemd/systemd-journald 
    root      6813   0.1   0.4   328      131      ?      S     Jun12  27:49    /usr/libexec/ctdb/ctdb-eventd -P 6811 
    root      2868   0.0   0.2   714      83       ?      Ssl   Jun12  7:44     /usr/sbin/rsyslogd -n 
    a50576    6815   16.5  0.2   2293     78       ?      Sl    10:05  18:12    /sas/grid/software/SASFoundation/9.4/sasexe/sas -noterminal -noxcmd 
    root      12020  13.7  0.2   426      75       pts/0  S+    11:49  0:46     /usr/bin/python /sbin/sosreport 
...

$ head -2 ps
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.0 28.3 12949440 9290408 ?    Ss   Jun12  15:21 /usr/lib/systemd/systemd --switched-root --system --deserialize 22