Right...
Well flight 175 hit its target at a much higher speed than the first plane. As a result, its body broke up on impact. A jet engine, or parts of were found close by immediately after the plane hit.
The reason there is no large exit hole is because the plane didn't travel through the tower the same way it did with the first one. The speed coupled with the flight path explain the reason.
In many ways its like how bullets can sometimes pass right through an object and other times, never come out the other side.
Also your bullet analogy is not quite right. You can take an aluminum shell and load it into a tank and it will turn to dust on impact and do no damage, you would have to send that shell at quite a few times the speed of sound before you could to even hope to do any sort of damage, WTC's outer steel was two layers of tank armour of say a T34.
For the wings to penetrate that steel and its a ****ing fact, they would have to have been travelling at mach 8 or something, simply because the structural connections of the wings to the fuselage could not possibly have the strength to hold those wings on to cut through that steel.
The main fuselage should punch through like a pencil in mesh, that is how that building was designed, to take multiple strikes.
Lets forget for one minute two sets of data prove that the "plane" flew at 500 knotts, but lets forget that inconvenience, the plane would have needed to travel at about mach 4 or more for the velocity to allow the wings to cut the steel before the structural integrity of the plane gave way and the wings snapped off or folded back. Remember it is claimed that an entire plane went into a tiny missile sized hole at the pentagon, and the wings are said to have "folded back" there. But the laws of physics change when it's the WTC.
Any objective critical examination of this whole thing makes it fall apart, such horseshit. Physically impossibly, and when there is actual video evidence from the sources we all love.. silence