Invisible Cowboys - Recap

Now you know about the common points between the four different groups, say why they have been hidden or forgotten or erased.

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Toolbox

They are likely to have been forgotten because ...
It's highly probable that ...
Chances are they were forgotten because ...

They may have been forgotten because ...
They must have disappeared due to the fact that ...

Perhaps they were hidden because ...
They were probably / possibly / maybe hidden because ...
They certainly, undoubtedly, no doubt, without any doubt, surely were erased by ...

I can imagine that ...
I presume / I guess / I suppose / I assume ...
I suspect ...

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