Inviting one more might upset the numbers. It may make it difficult to sit around the table or play a game or even upset the symmetry. Inviting another might make the discussions difficult, may ‘slow’ progress, might result in a debate.
Inclusion might add a complication. But do it anyway.
Build a bigger table, find an extra chair, add a little water to the soup. Inclusion may slow us down in the short term, but often helps us go further.
Choose kindness. Always.