Is this a model or an expression of what took place?
At what point, by adding Tutor engagement, and then picking out individuals in relation to their tutor group forum participation do you make assumptions?
A questionnaire would elicit the facts.
At some point the complexity of the activity shown diminishes the ease at which the chart is interpreted.
I'd replaced the imploring 'HAVE FUN!' with the more germane 'ENGAGE!' i.e. take part, I say this because debate and discussion may not be fund with a smile.
Often I liken a session that spins out of control as a Catherine-Wheel nailed to a post that fizzles and falls ... or winds down. Some activities can be like this, 'full of sound and fury, signifying nothing.'
They tend to be the most fulfilling, where everyone in the group takes part. Or at least SIX on a regular basis to give the thing some spin.
Failure to participate is the killer; with it an activity can be a wild success, drawing people in, urging them to take part. Without them you are on your own 'with your books and your thoughts.'
The reality of distance learning online is a bit of both, the trick is to be able to engage and disengage with reasonable flexibility, not feeling guilty whether you are quiet for a period or when you are ever-present.
The role of the tutor is a tricky one
Mentor and coach, or subject matter expert? Institutional insider to guide? Overseer? Absent landlord? Marker? Assessor? Animateur?
The role is changing. It will be as different as it is in the 'real' world from the one-to-one private tutor, or the 'gang master' running 60 students via pre-recorded video lecture. Customers, as students can call themselves with greater validity if they are paying significant sums, will be demanding.
'Change is all around us'.
(Sung to the tune of Wet, Wet, Wet's 'love is all around us').