You've only replaced one of his functions.
1	You	you	PRON	PERS-P2	_	4	nsubj	_	SpaceAfter=No
2	've	have	AUX	PRES-AUX	Mood=Ind|Tense=Pres|VerbForm=Fin	4	aux	_	_
3	only	only	ADV	_	_	4	advmod	_	_
4	replaced	replace	VERB	PERF	Mood=Ind|Tense=Past|VerbForm=Fin	0	root	_	_
5	one	one	PRON	IND-P3SG	_	4	obj	_	_
6	of	of	ADP	_	_	8	case	_	_
7	his	he	PRON	P3SG-GEN	Gender=Masc|Number=Sing|Person=3|Poss=Yes|PronType=Prs	8	nmod:poss	_	_
8	functions	function	NOUN	PL-NOM	Number=Plur	4	obl	_	SpaceAfter=No
9	.	.	PUNCT	Period	_	4	punct	_	_
