Follow-up: my (early!) cofounder pointed out to me that "late cofounder" is an oxymoron. To "found" implies being present at the beginning, or more precisely at

Follow-up: my (early!) cofounder pointed out to me that "late cofounder" is an oxymoron. To "found" implies being present at the beginning, or more precisely at the bottom (as in "foundation"). The new is oxymoronic in terms of the old.