So he drilled holes in the windows, then smashed them out?
The question is where is the evidence of the means used to drill those windiws? Why can”t anyone tell us exactly how it was done? Seems like that would be 101 detective work. Were the drills removed and why?
Given the level of calculation seen in this crime - not unreasonable to speculate he may have intended to make some sort of small opening in the windows - without creating an alarm or loud sounds.
I’ve had my doubts about the “smashed with a hammer” theory - I suspect that is much harder than you might think.
Also can’t discount the effect of the breach - if it was an explosive breach - it may have blown out the already weakend/cracked/shattered windows.
We don’t know what the windows looked like DURING the attack - only after.