House Inspection 3
Pictured below is the edge and corner of a window removed from the house at the time of inspection.

Take further note of insect penetration (web nests) of the part of the panel window frame that presses up against the exterior edge of the window frame in the house wall. That should be sealed from the outside. If insects can make it past the exterior window glass frame then water and air can also pass.
It is within reasonable logic to assume that a window should not have a weather permeable crack in its frame or seal.
The inspector dismissed this window defect and passage for insects, air and water from the window exterior to interior as not contributing to any water infiltration.
Recall the picture above showing how water, air and insects can pass from outside through to the inside wood window frame. That fault was identified in house inspection #2 as shown in the pictures below.
The inside decorative wood trim was removed to expose the gap between the window house wall frame and the window panel frame.

Note the water stains in the bare wood at the top of the window frame.

This point of water entry is exasperated by the wind bellow effect flexing the window glass panel and frame within the window house frame.The structural water protection of this entire window unit is dependent upon this one small seal that fails, as determined by the series of events that lead up to discovery of the key window defect that allows water to penetrate through to the house interior.
This defect will be discussed in detail elsewhere in this web site about this leak type that is one of three different documented types of leaks on the same panel window design.

The homeowner told the window company contracted house inspector about this (the window inspection 2 demonstration shown above) during inspection #3 and the company contracted inspector refused to explore this possibility.