If Peter Quill is son of a Celestial, why the Stark Family cannot be descendants of the Aspirants?

BADASSIUM: THE SOUL STONE

If the Infinty War movie will be the conclusion of the MCU starting in 2008 with the first Ironman movie (forget the old Hulk) and combine this with the Ironman 2 almost a direct sequence of the first movie. So it is not necessary look for into the future to find the last infinite stone of the MCU, but it always was there, in the heart of Stark family.

Because as is say in the Marvel wiki:

"Following his recovery of the Tesseract from the bottom of the ocean, Howard Stark began closely researching the object as he believed it to be the key to limitless, renewable, clean energy. During the course of his study of the object, Howard theorized a new element structure that could partially replicate the energy of the Tesseract.

However, limited by the technology of his time, Howard was unable to create the element for himself and instead left the blueprints for the element hidden in a model of the Stark Expo fairgrounds for his son Tony to discover later. Evidence of Howard's research with the Tesseract was later indicated through several drawings of a hypercube, a theoretical representation of the Tesseract, spread throughout many of his research notes.

In the months following Tony Stark's continued activities as the armored hero Iron Man, he became afflicted with palladium poisoning from the degrading palladium cores from the Arc Reactor embedded in his chest, accelerated by the continued use of his Armored Suit. Tony sought to find a replacement material for the reactor's core, but no known element was compatible with the Arc Reactor.

S.H.I.E.L.D. became aware of his problem and Nick Fury gave him a package that once belonged to his father. In the box was a film reel where Howard strongly suggested that there was something hidden in a model of the Stark Expo. He discovered that the buildings in the model formed the atomic structure of a new element. He recreated the element by using a Particle Accelerator in his basement and created a brand new Arc Reactor to utilize the new core and a new suit that could better utilize the higher energy output.[2] He later tried to get it patented as "badassium" but ran into many legal issues.

It remains to be seen if Tony uses the new element to power his Iron Legion drones, or he has simply resume use of palladium for constructing arc reactors for the drones, due to both the drones not requiring technology as advanced as the armors he personally dons, and palladium poisoning not being a concern at all." 

Source: http://marvelcinematicuniverse.wikia.com/wiki/Tony_Stark%27s_New_Element<> />

“What does that look like to you Jarvis? Not unlike an atom” " - Tony Stark

However what build my argument is:

"Before creation itself, there were six singularities. Then the universe exploded into existence, and the remnants of these systems were forged into concentrated ingots... Infinity Stones." ― The Collector

"The Infinity Stones are six immensely powerful objects tied to different aspects of the universe, created by the Cosmic Entities so that way, each of the stones can possess unique capabilities that have been enhanced and altered by various alien civilizations for over millennia of years.Only beings of immense power can wield the stones, such as when the Celestials used the Orb to pass judgment on entire planets, although sorcerers, Celestial hybrids and androids appear to have the capability of using the power of the Infinity Stones. 

The Soul Stone has a orange color, its original containment unit is unknown, its current location is unknown, its current owner is unknown. However according to Wong's ancient texts, the Soul Stone could prove to be the greatest threat out of all the Infinity Stones."

Source: http://marvelcinematicuniverse.wikia.com/wiki/Soul_Stone<> />
 

So if Peter Quill is son of a Celestial, why the Stark Family cannot be descendants of the Aspirants?