My grand unifying Highlander universe theory

My grand unifying theoy
Immortals were originally an evolutionary offshoot of the human race who evolved in ancient prehistory. Rather than see normal humans die off through natural selection they left Earth and established a new home on the planet Zeist. Alternatively Earth was a colony of Zeist and eventually overthrew their rulers but not before the 2 species had interbred to the degree that immortality aside we are indistinguishable from one another.
In Zeist society the punishment of challenging the ruling regime or other crimes is to be memory wiped, youthed into babies and transported through time to random periods of Earth history (Highlander;TS and Highlander 4 establish that all Immortals are foundlings). Thus it is possible for Connor and Ramirez to meet one another in Highlander and have no memory of their past life together but Connor’s memories are restored once he wins The Prize. When he resurrects Ramirez his memories are restored also.
Rather than a single prize to be won out of all the Immortals there are a series of prizes to be won by each generation of Immortals who have acquired enough quickenings. Thus Connor does indeed win ‘The Prize’ for his set of Immortals in the original Highlander film, gaining mental powers and can choose to have children and grow old if he wishes to. ‘There can be only one’ therefore refers to one Prize per grouping and eventually if there is only one Immortal left out of all then they will be all powerful, perhaps enough to rule both Zeist and Earth. Other immortals such as Cassandra who display supernatural powers may also have gained them by winning prizes over the years (notably Cassandra as Methos’ slave girl lacks the powers she will later exhibit when she meets Duncan).
So although we see Connor die in Highlander; Endgame it’s possible that Duncan is later able to resurrect him using the same process we see Connor bring back Ramirez with in Highlander 2. Hence Connor is alive again in the future and can build the ozone shield over the earth.
And what is the source of Immortal’s power? The spiritual essence of the Zeist religion, a Jedi/The Force like entity represented by the dragon like creature we see when Connor gains The Prize and which forbids him and the villain fighting on Holy Ground in Highlander 3.
So that’s my theory and I think it covers most of it