@Tacoma3G a somewhat easy solution would be to just create the widget twice and hide via CSS.
Code:
.p-body-pageContent [data-widget-definition="member_stat"]
{
display: none;
}
@media (max-width: @xf-responsiveWide)
{
.p-body-pageContent [data-widget-definition="member_stat"] { display: block; }
.p-body-sidebar [data-widget-definition="member_stat"] { display: none; }
}
Top line would hide the one inside the content area, then show in mobile while hiding the other one in mobile.