The quad and calf injury can they somehow be related to the oblique tear.??
I love this kind of question.
It's possible.
How one injury can lead to another comes from one or both of: 1) Restriction that builds up during the healing process, limiting the travel of a muscle and therefore the bones it's moving; 2) A habit of favoring - not using, or limiting the range of a muscle that causes pain when it's contracted, which then becomes habitual even after it's healed.
Obliques rotate the spine and ribs, or to be more precise they maintain the relationship between pelvis and spine/ribs. As such they are active in straight-ahead running, where the pelvis rotates and rocks as you alternate legs, while the spine does the same; and even more active when you are moving laterally or changing direction frequently.
That means that restriction or favoring of a healed oblique may make running more asymmetrical (even pro athletes seldom have really good symmetry); you could easily imagine using quads to make up the difference, leading to increased load on them on one side, leading to strain, blah blah.
As I say, it's possible, but on the other hand there are just too many factors involved to draw a straight line.
It is fair to say
in general that any injury to a pro athlete makes further injuries more likely. Gordon Hayward got through last year without anything catastrophic happening, which is a good sign for him this season (DeMarcus Cousins did, too, but his offseason wasn't so lucky).
Athletes who function more asymmetrically are more likely to get injured, and injuries tend to add to more asymmetry, making the kind and extent of rehab critical. I believe that Cousins came back too early, and it cost him.
Boston has a good track record of drafting players with good symmetry coming in - Jayson Tatum stands out, as does Carsen Edwards this year. (This is another good reason, by the way, to have passed on Fultz and Lonzo).