11191、他　OSPF　DR/BDRはいつ決まるか

マルチアクセスの場合は2wayの「最中」にDR/BDRが決定される。
DR/BDRが決定した後にEXSTARTに移行し、EXSTARTの最中にマスタ/スレーブの決定、DBD交換の為のシーケンス番号決定が行われる。

上記のように理解していました。
Web問題集の解説だとEXSTARTでDR/BDR決定と書いてありますがdebugみてもEXSTARTの前にDR/BDRは決まっているように見えるんですよね。
(該当する問題は複数あると思うのでIDは一例として11191)

ちょっとした解釈の違いかもしれないので解説の誤りでは？と言う気はないのですが
もし、よりベターな書き方があれば修正を検討して頂きたいです。
(もちろん、私の理解に間違えがない場合です)
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R1(config-if)#do debug ip ospf adj
OSPF adjacency events debugging is on
R1(config-if)#no shut
R1(config-if)#
*Mar 1 00:16:18.219: OSPF: Interface FastEthernet0/0 going Up
*Mar 1 00:16:18.723: OSPF: Build router LSA for area 0, router ID 10.0.0.1, seq 0x80000004
*Mar 1 00:16:20.203: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up
*Mar 1 00:16:21.203: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
*Mar 1 00:16:23.059: OSPF: 2 Way Communication to 10.0.0.2 on FastEthernet0/0, state 2WAY
*Mar 1 00:16:43.047: OSPF: Rcv DBD from 10.0.0.2 on FastEthernet0/0 seq 0x10 opt 0x52 flag 0x7 len 32 mtu 1500 state 2WAY
*Mar 1 00:16:43.051: OSPF: Nbr state is 2WAY
*Mar 1 00:16:48.047: OSPF: Rcv DBD from 10.0.0.2 on FastEthernet0/0 seq 0x10 opt 0x52 flag 0x7 len 32 mtu 1500 state 2WAY
*Mar 1 00:16:48.047: OSPF: Nbr state is 2WAY
*Mar 1 00:16:53.071: OSPF: Rcv DBD from 10.0.0.2 on FastEthernet0/0 seq 0x10 opt 0x52 flag 0x7 len 32 mtu 1500 state 2WAY
*Mar 1 00:16:53.071: OSPF: Nbr state is 2WAY
*Mar 1 00:16:58.039: OSPF: Rcv DBD from 10.0.0.2 on FastEthernet0/0 seq 0x10 opt 0x52 flag 0x7 len 32 mtu 1500 state 2WAY
*Mar 1 00:16:58.043: OSPF: Nbr state is 2WAY
*Mar 1 00:16:58.219: OSPF: end of Wait on interface FastEthernet0/0
*Mar 1 00:16:58.219: OSPF: DR/BDR election on FastEthernet0/0
*Mar 1 00:16:58.219: OSPF: Elect BDR 10.0.0.1
*Mar 1 00:16:58.219: OSPF: Elect DR 10.0.0.2
*Mar 1 00:16:58.219: OSPF: Elect BDR 10.0.0.1
*Mar 1 00:16:58.219: OSPF: Elect DR 10.0.0.2
*Mar 1 00:16:58.223: DR: 10.0.0.2 (Id) BDR: 10.0.0.1 (Id)
*Mar 1 00:16:58.223: OSPF: Send DBD to 10.0.0.2 on FastEthernet0/0 seq 0x1F12 opt 0x52 flag 0x7 len 32
*Mar 1 00:17:03.063: OSPF: Rcv DBD from 10.0.0.2 on FastEthernet0/0 seq 0x10 opt 0x52 flag 0x7 len 32 mtu 1500 state EXSTART
*Mar 1 00:17:03.063: OSPF: NBR Negotiation Done. We are the SLAVE
*Mar 1 00:17:03.063: OSPF: Send DBD to 10.0.0.2 on FastEthernet0/0 seq 0x10 opt 0x52 flag 0x2 len 92
*Mar 1 00:17:03.087: OSPF: Rcv DBD from 10.0.0.2 on FastEthernet0/0 seq 0x11 opt 0x52 flag 0x3 len 72 mtu 1500 state EXCHANGE
*Mar 1 00:17:03.087: OSPF: Send DBD to 10.0.0.2 on FastEthernet0/0 seq 0x11 opt 0x52 flag 0x0 len 32
*Mar 1 00:17:03.107: OSPF: Rcv DBD from 10.0.0.2 on FastEthernet0/0 seq 0x12 opt 0x52 flag 0x1 len 32 mtu 1500 state EXCHANGE
*Mar 1 00:17:03.107: OSPF: Exchange Done with 10.0.0.2 on FastEthernet0/0
*Mar 1 00:17:03.111: OSPF: Send LS REQ to 10.0.0.2 length 12 LSA count 1
*Mar 1 00:17:03.111: OSPF: Send DBD to 10.0.0.2 on FastEthernet0/0 seq 0x12 opt 0x52 flag 0x0 len 32
*Mar 1 00:17:03.115: OSPF: Rcv LS REQ from 10.0.0.2 on FastEthernet0/0 length 48 LSA count 2
*Mar 1 00:17:03.115: OSPF: Send UPD to 10.0.0.2 on FastEthernet0/0 length 72 LSA count 2
*Mar 1 00:17:03.127: OSPF: Rcv LS UPD from 10.0.0.2 on FastEthernet0/0 length 64 LSA count 1
*Mar 1 00:17:03.127: OSPF: Synchronized with 10.0.0.2 on FastEthernet0/0, state FULL
*Mar 1 00:17:03.127: %OSPF-5-ADJCHG: Process 1, Nbr 10.0.0.2 on FastEthernet0/0 from LOADING to FULL, Loading Done
*Mar 1 00:17:03.151: OSPF: Rcv LS UPD from 10.0.0.2 on FastEthernet0/0 length 60 LSA count 1
*Mar 1 00:17:03.631: OSPF: Build router LSA for area 0, router ID 10.0.0.1, seq 0x80000005
*Mar 1 00:17:03.635: OSPF: Rcv LS UPD from 10.0.0.2 on FastEthernet0/0 length 64 LSA count 1
*Mar 1 00:17:08.119: OSPF: Rcv LS UPD from 10.0.0.2 on FastEthernet0/0 length 60 LSA count 1
R1(config-if)#do no debug all
All possible debugging has been turned off
R1(config-if)#