After a short analysis with
rpm -q --requires packagename
rpm -q --what-requires packagename
I can tall you that one big dependency initiator is dash. Because of it's dependency on python the following packages share the same dependency:
first level: dash
second level: x11-server-common
third level: x11-driver-video-v4l, xinitrc, x11-server-xorg, x11-server-xvfb, xfs
fourth level: x11-driver-video, task-x11, xinit, gdm, chkfontpath, xorg-x11-xfs
fifth level: gdm-themes-relaxing-water
A small dependency initiator is newt
first level: newt/whiptail
second level: alsaconf
Then there is x11-proto-devel
first level: x11-proto-devel
second level: libxrender1-devel, libxt6-devel, libx11_6-devel, libice6-devel, libxau6-devel, libxcb-devel, libsm6-devel, libxdmcp6-devel, libxext6-devel
third level: libcairo-devel