@WilliamR.Ebenezer The extent of the Jahn Teller distortion is variable for different types of electronic configurations. If you look
here under the simplified overview tab, you will see a table there,under Jan Teller effect that will show that no distortion is expected for high spin d6 complexes 2) The polarizing power of the cation also plays a huge role in any form of charge transfer being affected. Zn2+ is much more polarizing