And according to ר"א who holds liable one who does a תולדה together with the אב; why is it called an אב, etc. - ולרבי אליעזר דמחייב אתולדה במקום אב אמאי קרי לה אב כולי
Summary:
Depending on the גירסא, there may or may have not been תולדות in the משכן.
But perhaps they were staggered - ודילמא שלחופי הוו משלחפי
Summary:
We cannot surmise that זריקת ד"א took place in the משכן when throwing the בוכיאר, because it is possible they were sitting within ד"א of each other.