Lego blocks

Growing up, I never believed in the Lego motto, "Half the fun is in building it yourself". A self assembling Lego Kit was what I really wanted, but with CES 2017 ending and no word from Lego it might remain a dream.

If you think of Lego blocks as atoms, self assembly is a dream that has been realised. The following scheme related to the synthesis of Alistonitrine A illustrates this:

We start with the above compound,

• We add $\ce{NaBH_4}$ and tert-Butyldimethylsilyl chloride in presence of imidazole . We then heat it in presence of silica gel to obtain A . It possesses $\ce{C_{39}H_{63}O_{9}N_{3}Si}$ as its molecular formula.
• A reacts with Lithium bis(trimethylsilyl)amide and Iodine gas while slowly being heated to room temperature to give B .
• B is hydrolysed in aqueous $\ce{KCN}$ and later heated in $DMF$ to give C whose molecular formula is $\ce{C_{37}H_{61}O_{7}N_{3}Si}$ .
• C reacts with Tetra-n-butylammonium fluoride and later with Pyridinium chlorochromate to form compound D .
• D reacts with $\ce{PCl_{5}}$ to generate E .
• E with Trimethylsilyl trifluoromethanesulfonate and 2,6-lutidine to generate a intermediate X . In presence of $\ce{K_{2}CO_{3}}$ , X reacts to form F
• F reacts with $\ce{NaOCl}$ in presence of a catalyst to generate the required compound.

Let $\alpha$ denote the number of rings in compound A and $\beta$ denote the number of rings in B .

Find the value of $\alpha - \beta$ .

Bonus :

If the catalyst used in the final step has the following structure:

What type of symmetry elements does it possess?