Synthesis with S grad Monster?!?

Hi!
My question is i want Synthesis Thor. If i use a S grad Lupa for this get i a S grad Thor?

Gimpling

I synth mischief s with jack s and got echo s with a stats

You will need all monsters S to get S synth monster
with 1 or 2 stats A Not a full S though

For Synthesis Thor you Need 4 Monster. Only Lupa is S the other is D grad. I think than i get no S or A grad Thor. S...