Juan de Santiago or de Santiago Escobar

I am trying to sort out an interesting question about Juan de Santiago or de Santiago Escobar.

There is a Juan de Santiago, husband of Gertrudis Navarro, was buried on 1 Sep 1729, in Aguascalientes. If I read the burial record correctly, he was married three times (only Gertrudis Navarro is mentioned), and had 45 legitimate children, of who 24 were living at the time of his death!!

There is a Juan de Santiago (also known Juan de Santiago Escobar) who married Antonia Ruis de Esparza on 6 Jul 1665, in Aguascalients. They had at least these children:
-Juan, chr 8 Mar 1666
-Marcos, chr 8 Mar 1666 (married Beatriz de Aguirre)
-Joan (Juan), chr 30 Sep 1667
-Antonio de Santiago y Escobar, chr 5 Sep 1670 (married Juana Maria Delgado)
-Juan, chr 30 Mar 1673 (apparently married Rosa Romo de Vivar [I can't confirm this])
-Francisco, chr 30 Mar 1673
-Joseph, chr 4 Sep 1676
-Maria, chr 14 Apr 1680
-Juan de Santiago Escobar, chr 30 Aug 1682 (married 1. Josepha Flores and 2. Gertrudis Rosalia de la Paz)
-Miguel Antonio de Escobar y Santiago, chr 23 Apr 1685 (married Maria Sotelo de Villalpando)

Juan de Santiago married again, Gertrudis de Esparza y Rangel Castilla (or Ruis de Esparza) on 7 Oct 1698 (the marriage record says he is the widower or Antonia). They had at least these children:
-Josepha chr. 11 Oct 1699
-Salbador de Santiago de Escobar, chr. 9 Sep 1701 (married Elena Lorensa de Villalpando)
-Francisca, chr. 16 Mar 1703
-Maria, chr 14 Aug 1705. The baptismal record does not say that her mother is deceased.

There is a Gertrudis (no last name) wife of Juan Santiago who was buried in June 1705.

Juan de Santiago (or de Santiago Escobar) married Maria Gertrudis Navarro on 26 May 1706. There is no mention that he is a widower. They had at least these children:
-Joseph Manuel, chr. 8 May 1707
-Maria Juliana, chr. 11 May 1711
-Catha. Cecilia, chr. 8 Dec 1716
-Augustina, chr. 7 Sep 1723
-Maria de Siberia, chr 26 Apr 1725
-Mathiana, chr 30 Mar 1727
-Maria Isidra, no baptismal record, born bef 1729/30 (married Manuel Jaimes)
-Brijida, no baptismal record, born bef 1729/30 (married Joseph Theodoro Martin Ruis de Esparza)
-Juana Josepha, no baptismal record, born bef 1729/30 (married Miguel Antonio de Medina)

If these two Juan de Santiago's are the same, I am missing numerous children, but do account for most of the 24. If some of the children were stillborn, they would not have been baptised, which would explain the lack of baptismal records. Would they have been in the burial registers?

My question: Are these two Juan de Santiago's the same?

Has anyone come across these (this?) families. I would be interested to hear.

George Fulton
Pleasanton