Can Apple really make 4.5" IPhone 6, without increasing footprint of 5S?

Iphone-6-concept-12_medium

via i2.wp.com

There have been tonnes of roumers about how iPhone 6 will look like and I have following observation:

1. Apple could be adding up atleast 1 mm of space, by pushing the home button slightly below its current position. This provides them a total space of 2 mm from both top and bottom.

2. The bezels around the screen take up a mm each. A no side bezel iPhone will add atleast 2 mm to iPhone Display.