I dont have the book handy, but as I recall, he goes into more detail about the spider webs than Steve Thomas did. They both pointed out that the type of spider that spun the webs is dormant in the winter and would not have been making webs across the open areas of the broken window at that time (according to experts that were consulted). Beyond that, if it had been broken from the inside there would either be broken pieces of glass on top of the debris in the window well or no debris at all from the cleanup. If it was broken from the outside, there would have been more broken glass on the inside of the room (or signs of a recent cleanup).
And if there is any doubt just how it looked, Kolar included a portion of the actual police video taken that evening.
http://www.thedailybeast.com/articles/2012/07/18/new-clues-in-jonbenet-ramsey-murder.html#
Thanks to cynic for posting the video, just in case the TDB article gets lost or deleted:
DBKPV - YouTube
So, as with most things "Kolar" there is actually no new info at all. A little more detail perhaps, but we already knew of the spider web, and we've had 16 years to consider which side the window was broken from.
There are in fact signs of a recent cleanup. The piece of glass FW found and placed on the suitcase. Yes, it could have been there since summer, with the kids playing in the area and everyone (JR/PR/LHP) oblivious to the poor cleanup job. Or, it could be a sign that the glass was cleaned up that night/morning, hastily, and not thoroughly.
I don't see anything in the video which makes me conclude it was "impossible", or even improbable that the window was broken that night. In fact, I'd say it seem far more likely than a millionaire living with a broken window since summer, and the glass not being cleaned up completely during all that time, despite the room being a play area for the kids.
In one of the police interviews PR said she asked LHP to go behind her with the vacuum and clean up the glass - this was supposed to be back in the summer when JR supposedly stripped to his skivies and broke into the house through that window. The problem is LHP denies knowing anything about a broken window. She was the housekeeper. If there was glass to clean up she'd know about it. If she'd been asked by PR to vacuum up glass she'd probably recall that - as "Ramnesia" doesn't provide any benefit to LHP.
Then there was the statements by both PR and JR that they couldn't really recall if the glass had ever been fixed. C'mon, it wasn't that long ago. Is it really that hard to recall if a glass company came and fixed the window?
Of course if it had been broken during the summer, and if it had been fixed, then it might have been the intruder who broke it -except why would an intruder have cleaned up most of the glass? OK, so it couldn't have been fixed, so if it hadn't ever been repaired since JR's break in, why is there still a piece or two of glass lying around months later? Why has the window remained unfixed all this time? Why are the family taking the security risk of an open window? Why are they letting the heat go out the window? Why are the risking allowing vermin to come in the window?
Kolar gives us nothing that would make us conclude that the window could not have been broken that night/morning. In fact, when you consider that the glass wasn't cleaned completely, that PR lied about asking LHP to vac up the glass, and the window remaining broken for months on end (if JR's story were true) then it seems much more likely the window was broken that night/morning.
Note also that in the video we see the broken pane. Would they really have left all that jagged glass in place all those months with the kids playing in that room? No cardboard even taped over the hole?